Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f201083a9baa99…

MALICIOUS

PDF

88.8 KB Created: 2021-07-01 12:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b388b0e0242f5dcb8ade36cac13b945d SHA-1: aa9297a92a1c5c26baed4fc87204ad9bfcbae65a SHA-256: 25f201083a9baa9903bd4f6fe5e6b97cab18a6df91579583aa7b1541e9e230b1
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the primary attack pattern involves luring users through a seemingly legitimate document to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://altinhediyeler.com/calisma2/files/uploads/18473471590.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d5c62c95e6c8005fe3795e0bc61f7b0c/giluputopazubikufozere.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/neduxuxadedinu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/487aae4fb780af17d28500ab13a126ba/10830552414.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/zefosogorire.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/6671231099.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/powijisexe.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/i59kumaltsq5792l918m8a2c95/fidosipuvaxifum.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5e342f5b4f3268985e323aa90aff3747/78559170100.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/67079033175.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d22750cbe76---zudokopefilofa.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d97061a0dbe110273c88998c87d0bb1a/supowuroferiromamuku.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/lidavuwomu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c935ccab019---86518786987.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620343810.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/43671020317.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/fgkhkqb7hc76latgpg0s0omnjt/ladibun.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/85d04b1e1a3fb458869ad3587ae88002/xutogovogajiladi.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/60486623355.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a571a59d85f---51807904985.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7eb751681f2d68e4afc2b8d8019ea1fd/71582781015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=formal+email+writing+formatPDF 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_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 17296 bytes
SHA-256: b9c61bde114e2545d541b565f400629312604ee5d12e7e6f021f2a17725738ef
font_01_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 10452 bytes
SHA-256: fd188a3dbaebb54a0f74df50f0e759a35a7e9e26dfc1709bc7a851eba072fb6b
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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