Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7661a78daf79009…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 11:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ab5b00744fcbcb7977224d264e2f2eb SHA-1: 21402e17999d50f63cd9c3336b2bb83197b87084 SHA-256: a7661a78daf79009b64e0efc6a47151741a3b52ac3e329c1aff95fc787a7f2cd
164 Risk Score

Malware Insights

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

The PDF contains numerous links hosted on compromised WordPress sites, suggesting a link farm designed to trick users into downloading malicious files. The presence of a 'download button' heuristic further supports a social engineering lure. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely acting as a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=ebooks+free+download+pdf+apple PDF link annotation
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/e9f0f618569c81c2406e6084e158e039/farokajabowu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/11929106102.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a515d9e3c1339949538cd719201810ec/85737048200.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e2963c7c4---weduzomiwanukudupulobelo.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210804_005105.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d84948d9772---41921465009.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91ad5b492808f673f91af8dd9b745ddd/vatoxonumuruk.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8bdcca54c---nudekoxoletawasujevaxiviw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90bc97dd3---namunufige.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/jazorubezovixasa.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/besaporenoda.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cc9f1735eaebfde89ec28534fce47486/moninirofaxujewaxosape.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/66c6abc427e4b9c11840e02dc3a3fae2/39736843427.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/23aa75a02d5bc9b48a4e4648c6088607/46654886583.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4dd6de1dd---pavibekekegapoze.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/vagoregurivutikalo.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1628499465.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/35838891494.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/aj7g9iqn5eorvban4vcpda3f31/nalixumebedumis.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/zozovowojuwaxat.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608294a94dab6---1066349386.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/30038484448.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/xobijakupewokiwuregenaz.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35e9b0650---54098142277.pdfIn PDF document text
    • 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_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 16800 bytes
SHA-256: 6005788d1179ee5ce7f5c2d0502bae59a7ca8e09d8c01feac30c6f9b1919aa1f
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10604 bytes
SHA-256: f3d77cf71b0d1c2b183ff7e50b11d3fa3a567b596d6c7ce8f47a465c36d9ff7b
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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