Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a1e41e9dc74c73…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 13:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fecf62e4afae2959f8a5707160d44e88 SHA-1: a36c892c8b01605183c37bbde61b85ad8e69f7f8 SHA-256: a1a1e41e9dc74c7346e4b0f7c54c1d88714e8563802520b51f6db78f26db1643
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/408165e47f182f0b71a755f1bcf9b0e8/razefarusawetuvofab.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f07f554---34064011143.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ckku8ddfdpgmrub6plsahm4ri7/27380943408.pdf
    • http://j1medical.com/uploaded/file/wufivufewutinapuluguxek.pdf
    • http://businessnavigator.in/ckeditor/uploads/files/balawitezividifuremukozop.pdf
    • http://thegioidahoacuong.com/uploads/image/files/66978714064.pdf
    • https://yukkumpulgroup1.com/contents//files/pimetibigekekiz.pdf
    • http://architettosirocco.it/userfiles/files/34496431101.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/12738541948.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160915799bdd98---36543405645.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc9f5229a---gijobebavesikumoru.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/sisekevajamotu.pdf
    • http://velo.hu/UserFiles//file/68134264201.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a1m79n2ookoeh97d7f8kopnand/13685552198.pdf
    • https://eravukappalpalli.com/userfiles/file/detojevipapojumolul.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04bffb5fd7---85346634896.pdf
    • https://33mobility.net/uploads/files/90622960456.pdf
    • http://szolnokepul.hu/userfiles/file/8170561612.pdf
    • http://eotp.info/sites/default/files/fck/file/gagijefotibolut.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ced88a0392b---peliwexetebasiwuk.pdf
    • http://e-hane.com/files/jejinilepenezipazus.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16106b334b6ed4---90888743294.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/fddc77ecd79a090c12c12fa8efd86391/84910129126.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=craftsman+5.5+hp+electric+start+snowblower+manual
    • 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_off0000d8ee.bin
b0bf90874f572255b8e10cdc77aa7182eb1d107a25cbf63f18a2acdca9343557
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 16964 bytes
font_01_sfnt_off00010485.bin
7fc46ae355135e8caf225e5981ab1bf371d2accaf9593b66719081accf8a9d11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 11304 bytes
font_02_sfnt_off00011ec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC5 16792 bytes