Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc571b0301377a6c…

MALICIOUS

PDF

148.5 KB Created: 2021-06-25 20:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 59e35001a4c3514dea35d48d74b128e7 SHA-1: ef87201cd5601ed25b411ae449d703c239a17b6c SHA-256: fc571b0301377a6c6631d82c9e09e7f5de50b5fb61851a150efe587782bf09a3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of 'invoice' and 'download' related heuristics, combined with the ClamAV detection for 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution campaign. No scripts were extracted, but the structure and URLs point to a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tskrea.com/userfiles/file/28058725520.pdf In PDF document text
    • http://anatolianlgs.com/userfiles/file/genolesuvunokemumib.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/62296354292.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef9d060e65---93623804078.pdfIn PDF document text
    • https://samowar.ch/upload/file/xozumiborofuguvipemiganup.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609870ffc8759---woxofasikanotele.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/eae63ec94875824ad912a61a719438e2/vupezogewetapevo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a0114371---rewamuloxidewevojob.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7033749278.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab8e4ed41---52793611299.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/30509492152.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742f02e0799---zujako.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946739d798---12708979060.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ua91grooe1vu46f6ie7orfmi73/41845473260.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/fagaxefawajojif.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/982bbcacea39e949e5b127b24c72603c/gabowusakawonuv.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/194f06550fd93bb9dac5b99f9f0ecfbd/lumoposunu.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-25/20210625045851811974.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4c0d9e97---33008561369.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c445cf75f05---jelarub.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/segozugonemimixotadag.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e216d6827f---23793349398.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917ac4acb26---45816035293.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57a96426a---80417711533.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c644f605641---pafiputagivoroxo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bd4de682---40146145825.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/046d4bc254f37b27879e378095962d06/darodomedadovoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=business+studies+exam+questions+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEDA 10848 bytes
SHA-256: c0b2142fb120a027ab3ca33df51d92d88e3ab3c18a07981f9aea71cc20e49e94
font_01_sfnt_off0001f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FE1 18788 bytes
SHA-256: b4c8483623b50419c8a9fc08ebdba2814e49ce505110a1d963e32b142d14dff1

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