Malicious PDF — malware analysis report

Static analysis result for SHA-256 f886cf49621d2e45…

MALICIOUS

PDF

78.4 KB Created: 2021-08-15 19:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd05616c2228086cce6bd7fffd79f4a9 SHA-1: 7b6d4648f44e284d8143401bd3e449eeff4d807a SHA-256: f886cf49621d2e45331deb0303acc3f903a6c5b3ee809e8bba7393589dd41310
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The PDF structure and embedded links are consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160796e81dcf8e---55523312022.pdf In PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/80133190443.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/xeletofotavomojijabidor.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4fb5d078721868bb9ae75e518b4a70b3/zotaxunilanesokif.pdfIn PDF document text
    • http://stromzeleny.cz/file/rojuzesexupuv.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/60160668232.pdfIn PDF document text
    • http://gerocuki.hu/user/file/28989933248.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/66869988560.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xiparuzebaxitugeja.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/56710049079.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b780224b7---60858540638.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9863715be8---fobajasojadasiveguwowifu.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/nuxaxelo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/9986638503.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tulowulepaduv.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/6334036738.pdfIn PDF document text
    • https://ismart99.net/upload/files/81648559490.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/12219376232.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/11751539713.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/42203163901.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b517d7a7a34865ec6ef20a0d054b511a/jopogilitibesozuzu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/41003241813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=are+subjects+in+school+capitalizedPDF 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_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 11024 bytes
SHA-256: 2836267f31c5fa3014c19311bb7c8b3a5646afc530552cc13b95b91f66762953
font_01_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16528 bytes
SHA-256: d7abbbd317b0c0e2b8497620cc3d68b1672b053ed3570dd9926d115467d625ee
font_02_sfnt_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1