Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b22ba01c191bfb6…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 14:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09c6755404a4f81d3d737d46ddb451c7 SHA-1: 2e142104d095ff837be96e428d19386924ce84fc SHA-256: 4b22ba01c191bfb6a281e540ead275cba1e8ad9c2fa8f2e014599b8d256b8220
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to distribute further malicious content or lead users to phishing sites. The presence of a callback lure heuristic also suggests a potential for social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d96ce8a6b090e3496f0e986d6901e019/bawobeli.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/46ec2f6db06c81235b526d06fb5c8950/javoremenabipu.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a829d7e234b---48719479157.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/735f7dae0509dda2855ed9366b8d5837/jadivepofevaxul.pdf
    • http://chroscina.com/userfiles/file/4824529949.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/97412173633.pdf
    • http://footstepfloor.com/upfiles/files/29200412028.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5c7fcf63688f8f9e078a82fad1e02cd2/56604943601.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zarevapurobabuxugifaj.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6b82d74b12d83a54fa0a695e68567d14/72773772477.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/04b7dc5ad3cf68a9517c80dd6d630b39/30965068810.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/11b43c04c7c3a8ff4b1ed86dbdccbb0b/83249355173.pdf
    • http://dianacb.cz/userfiles/file/98884707368.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e03c963f0a6ea72c117f6ba846575b33/66765061326.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b9b6a5ce---58339547267.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a01834b2d9e1c9807156976da2d585ad/28970941763.pdf
    • http://say-international.eu/userfiles/file/48719317898.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9575d0f34d865ac8b2ac3c687659fe3a/24967420409.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd6318e65---zibirezubap.pdf
    • https://allcreaturesinc.com/files/files/70567785431.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fumruilfa2co3qcfandm573juf/wirivenojukava.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/81156397804.pdf
    • http://alexlunacoach.com/img/editor/file/xujifagurifuxijazatago.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/88597196042.pdf
    • http://atek-ent.com/upload/file/rikoritetiwuvedabax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+sims+4+for+android+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee6c.bin
30056c9c48a3336f0f1b5f17b78e99ea7e70bd127316212abb2bdc49f7f2fe6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10752 bytes
font_01_sfnt_off000106f1.bin
3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 1672 bytes
font_02_sfnt_off00010edf.bin
8c313ac33e31c2c5e328f59af8dbe979877659830f71fd03935c8016da5dc610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 18964 bytes
font_03_sfnt_off00013e67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 16792 bytes

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