Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8957d5f2d1f849…

MALICIOUS

PDF

84.5 KB Created: 2021-06-25 22:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 796e210c9e4a1b2cfe46b34c87ecffb0 SHA-1: c66b48f8c96acfd1810167c4283d045a867e3517 SHA-256: ef8957d5f2d1f8494ae2936d7bd86062d0bc46396586fc5a8fe8ecb5e4299330
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links to potentially malicious PDF files on compromised domains suggests an attack pattern focused on directing users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf0876386---tigamaxoxivufetirike.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607930130da5b---xavagolegugo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c2316ab59---sizapilulop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3c7nueo9pbkdt13pmraejb2r8o/rabebuninosanilexexipemu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/fkdcjks0cr1l0m0uol9pcdclmn/degeruxibomemewabanunox.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210609121245_988w7h.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/sixitarubevelomipur.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c490f3ee0---jokaverujonobilobab.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/fcaa402ceb3bbeef563e5fd88b26cbfc/56566104901.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42ce5bcd0---22132115691.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2789001793d2052b8a37f43b16bf060d/11284463685.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afda8c3a0f8---16546940272.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/kijaxuxodemodimofosas.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/50497446116.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160816466d8438---belivafusixemanovazo.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lafgnj3fbnkav2f1l1k3gsjm4u/23644436502.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5u7ss9at9rhqccmc4p2eojpela/13275851201.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721c2824d7a---91298941623.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/19670576.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/julitap.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfuepih7bcbg80f2n4gbceue5h/12531973798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=buttonbush+growing+conditionsPDF 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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10688 bytes
SHA-256: 82f55a9596adbb7ad2b496a224c4c5e08aa01f0757d5ee2da6d3200fc7d5c107
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 17244 bytes
SHA-256: 1fc22809497417dfc626a453fbd30bcd5753f52eacac5ba1675913eaaac96918
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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