Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48ae237df347cd6…

MALICIOUS

PDF

90.1 KB Created: 2021-06-20 10:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5fea4eb1701b39d50f5fb9943406ac65 SHA-1: aa34a8add7a67fb60aa66e9eb660bae298c0397a SHA-256: f48ae237df347cd679ee9ef400ffd17671e3079d57c807796e43ed1e6d030ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vj3enhn156phr8oqc773dbaapp/jeripiserizimowozodejud.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/93eh481fhgbn74v5cn48lqr6s4/4771882600.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1ff0b6fc---tironupixuruluzoxoruviwu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/xuxamume.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/pfju558bj9fvbtvl5rlpp36cil/bupigifixu.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/368fab5eba2f90e4422ca783c773b9f5/joduzuvoziwiwavaronem.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/94203234734.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b76cc5fe7---46991888617.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/nuwafi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/78d34868940555581956fcd71190accb/60004715512.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/pb6rtndk960aeomva6b3f8pb92/3908240072.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9459200841d8ef9b14d893d9118c303e/murupozadojoredimuvirija.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zusixebiwemuv.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3aa9af8c8193b48e77c777e0005a9645/5599225646.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/9e40dc1e57888a6e303b1d1e451aca4a/31009479349.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=farm+chart+of+accounts+examplePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 5280 bytes
SHA-256: 4db3c17c78e5f7ab7717971c77f86df9066e22a76adfcf3681cdabbbfbf216ca
font_01_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 11720 bytes
SHA-256: 5aaefa8a3e3d7b47a1610a9d25cac450b7a4608f4ad45e8f833c2a88550d533a