Malicious PDF — malware analysis report

Static analysis result for SHA-256 78964756e7785d56…

MALICIOUS

PDF

73.8 KB Created: 2021-06-30 16:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8ab369926fe0544ba5e89b4bf9174fe SHA-1: 29ba00ab7ed6db74c44829859cd882a49c3bdfa6 SHA-256: 78964756e7785d567420995a467c87defefc0bed8821338864a9b2842c32efa4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://szolnokepul.hu/userfiles/file/46105724290.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c34db8a4f---xirenivolin.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/voziwarezufedaxomo.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/lulirawikesujofizuk.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b206f28531a---20407320624.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f36cc5ac3---69711381326.pdf
    • http://servmed.net/userfiles/file/gusijamejewozep.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b556f158d---lolukaluniribarikitut.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/d6d697301f9a1d842eedcaede7945775/zapokuxivufiba.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f8768827---11461420663.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/56ba023463c0208bcaa69d5293fdc534/81803191008.pdf
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35554439531.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/plk1pnec9ug4d73mnhjifrktua/vamexo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/90600233f2be28cc894bd5d057eeb56c/dipepodux.pdf
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/91231429317.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dfb816eb34c70f2c1f98513621f2c736/rovuwawujetimubekamagat.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/reludikilut.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0eb40fcc7---lexututos.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c141766f010---tonog.pdf
    • http://cpspcb.com/uploads/files/lipawuziwerapukafalurof.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c89c8db2211e1c55a4de169dcba5190b/rekujimi.pdf
    • http://rubivina.com/Images_upload/files/wibukukelaninazenunut.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/n90g4qoed4a1tvi7s4evlk5qg2/besofeverogekabajaxoji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=counting+colouring+pages
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf56.bin
46c3554be19d6cf28e2892e65f0891e133725971bb033718b416e8d46168627d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF56 10680 bytes
font_01_sfnt_off0000d802.bin
576791057eb93447693ce29858c13187a8d6615231ac5ad43ebea93bc021184c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16120 bytes
font_02_sfnt_off000101b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 16792 bytes