Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8258451e37d67a…

MALICIOUS

PDF

78.1 KB Created: 2021-05-27 07:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f537c05133e4b198b79459ba838cc97a SHA-1: 8c265e4d1fe1b75ec8a42c4812ef5af50f87131f SHA-256: 5d8258451e37d67a5e151d44bbaea2b0bfa075e4243dcfa13aa1f6a8a645b533
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/32e53e1eb0dd84c241f144f50cc11d10/61762649950.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c1aa3521---89929503430.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/09d957b12a9876abed500a7ef80bb5f5/bupore.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4ef1c4e5---fefulefowevewaketogamumus.pdf
    • http://angelcabrera.com/FCKfiles/file/60383176774.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2a4e5a95---runewakugi.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1253159479c66f1a10f6818a92d73b96/66084851246.pdf
    • https://ebooksweb.net/files/file/gelepiwiviparigumumuzazef.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/87593458301.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/33e5f819c01ca8480de66dad9f041c3c/20190801154.pdf
    • http://sivam.pl/files/file/mebegorifusasu.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2ef0752b---84471535186.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/c2a5b9039550203c166fe4504e06a178/vifojidifavuperez.pdf
    • https://usssecuritate.ro/userfiles/file/waxogijaxogovek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=warcraft+3+reforged+freezing
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b3061daad---sezefil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elem
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f320.bin
f881060d4b3e3b076a210158f2a830883e564bf70724b68e0cfcea52377aaf12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 5208 bytes
font_01_sfnt_off000104fd.bin
bca0dfcb8a05a2d4e65e24b3d541a50e619bd44b0475c35a3f4cdca097f045fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 13692 bytes

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