Malicious PDF — malware analysis report

Static analysis result for SHA-256 169a9756c27a808e…

MALICIOUS

PDF

88.4 KB Created: 2021-09-22 18:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d598aa1b5de11afea8a7355706d67bda SHA-1: bd35cfe7ddfd13c240b65b9373068ac2b2fb8a08 SHA-256: 169a9756c27a808e22284499cf21e1be34616afd044503877180b3efcfbbfeca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://mamap.in/ci/userfiles/files/mofigu.pdf In PDF document text
    • http://safiorida.nl/operatori/userfiles/file/91719364347.pdfIn PDF document text
    • http://blnk.eu/userfiles/files/46516582760.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/91025656431.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/24833549904.pdfIn PDF document text
    • https://landi-bg.com/images/file/tunelububafosivopid.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/70485049900.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/nusefati.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/25049570856.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d3167ab90cfb4b1d0a95022eafb7dd0e/16322617595.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161401037de8bd---41286888709.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/wenubofivolanizoxolen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456b83d5d15---patipinugominuxafupopulo.pdfIn PDF document text
    • http://aven.su/userfiles/file/87279023537.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/sotitisadowit.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109090257495639.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/19354487188.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/fifafera.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/89260430928.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/zavuribujeludujanarotiw.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xovirinidapoxi.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/ganune.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/063698c0008d6d71c8a338eb5f101062/benatukirazidebi.pdfIn PDF document text
    • http://pi-consulting.ch/download/73021011548.pdfIn PDF document text
    • https://harmony.im/userfiles/file/lijujakonikeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chicago+fire+season+9+123moviesPDF 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_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 11248 bytes
SHA-256: 1e4137f5f0a8a4caac291ed66aa4c2fd599269711cfa241d433703da5a80bfc1
font_01_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 18752 bytes
SHA-256: 28d2211f321af1c00168e3f2eaff68771798378a5078bd26c3188d210f813977
font_02_sfnt_off00013ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1