Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a7e3ecd24fb8b3…

MALICIOUS

PDF

96.1 KB Created: 2021-09-08 00:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c076c009a33c4cbfed4421b1164d0330 SHA-1: 1fdb4eb69cc4c257b1170ee7105fc09596afbe24 SHA-256: f8a7e3ecd24fb8b3e9feeb2c0deb5e20f3cc14f4d663855194aab7cba8db5b83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=zerodha+demat+account+charges+pdf PDF link annotation
    • https://mebelihome.ru/upload_picture/tusedaj.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/19hefg533n713fa6puhl0pous6/43974379852.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbc35134c---8732463501.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/kogiju.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/13906593929.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/64252017520.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/wolodewe.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2398dcefd7568efc28d6a4e962e8bdf5/xuvavepufoluxebesi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/wuzogoluputu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f0dcd970d---xowisato.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/87121149039.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/53698441341.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/88b4cce6d6d7890da5196c6d196db0d9/69971879478.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8d9cb10f---68719892400.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bbe270a43---39233954853.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af925e1b---37720690924.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103afc8d4b11---nibuvagizuzodolunulusapef.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/52242531517.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16102683bee05e---begetowirawo.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/luraxixarugapafode.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/92237058835.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_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 20408 bytes
SHA-256: f4872641e69e192d955c49d822a8e7ef92c737321ebc6df7f55c52319c6b1eaa
font_01_sfnt_off00014195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AC 10992 bytes
SHA-256: 90a9a37b9c90cb8384693094b95437f73eaef0ef30890bb9023c1e5815790679

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