Malicious PDF — malware analysis report

Static analysis result for SHA-256 115ace71240299ab…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 17:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbadd7fb394098c83925eed7efea6173 SHA-1: e8a956e0f304cdef3b5cafe65945c519d86ecb66 SHA-256: 115ace71240299aba55b9d37a45f0660c06752b68f0f6701a27e76e475a1221b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and urgency language further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/js6rpa3pkhrlg7jhcmcfbcfu7l/nametusexofafotovo.pdf In PDF document text
    • http://cuuhoatudong.com/upload/files/22422239486.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/32261149858.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/kobojudomesaretarovulodu.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210911_1310B97AF5C0F810.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/somojozejibatitup.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/11662767901.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d35f352ba7a85bd3595ab8aeae35d2b5/tulinedona.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/memuti.pdfIn PDF document text
    • http://schokozentrale.de/idata/36413544124.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/44678514692.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/31961445496.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/bemoru.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/93399522585.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/sorobapejesusovap.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/60932807186.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/sabaropujetezezopofuge.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/6080693209.pdfIn PDF document text
    • https://everestart.com/images/stories/file/zegof.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a943ac6dbe---76608209129.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210905072621.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32312145063.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/87589437897.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/86472057260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sembulingam+physiology+pdf+downloadPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 11264 bytes
SHA-256: f506bd84772953db23a20ecf43c09a332a6c03db2f93ab89f7874b1659bc382e
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 17488 bytes
SHA-256: da72fca784891db8821d62a1b18e6bd20c5805eb970a40c3105bcebe788dc1f5
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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