Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90a3d8d53c0efba…

MALICIOUS

PDF

186.8 KB Created: 2021-06-25 07:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ad193959d75eeec6035b07e1c01214b6 SHA-1: fb9e03165b89ef34bf99d301fbdf7ad1f2ab348b SHA-256: a90a3d8d53c0efbaabdf49d5e236a49c1c627cfc50e09572f46bd131e7245d99
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host or redirect to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to download a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ac1b7532c9ac1336188dcaadbaaebe9f/falikatunijojav.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/paxewadujalimovasar.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7nkb28qsokmj6j5gpuq1d2ntjj/nitijopabovep.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1pkeqe21la9u9k92pugfsus0q/74007455460.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/597bc05fe3172b3d4af020786e722630/mijoboxarogesemedopaxezo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/06133a95dae4b6dba18ce0ad96b7b44e/62867448633.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fb665b80afc5d1763df6134cf7963daf/4423110734.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/gajefubenofaraxovonuxodu.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/sedinux.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce9767f511---wolexajulumiwamijomefaw.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/de8d82e80b081ba824f5aae11c5d9f89/wijitalor.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f0rahdk3dlg0l0hjj2q1fl2o93/6525712449.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c34d0067979---tebibi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f91a07177e7a9a3f7352f3820711a2dc/sevemumabe.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/33900303262.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bbce7dbb---59778490274.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9dfc8ff19193b91b9af992090da95ce0/tigeke.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/11575884192.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/~3/3vuEKuznOb8/uplcv?utm_term=xerox+workcentre+3210+manualPDF 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_off00029104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29104 5460 bytes
SHA-256: 54771290ad83e26b8dbad841bb413680f6fd81a0329cbe78cd2bd7de41939209
font_01_sfnt_off0002a39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A39A 18948 bytes
SHA-256: 2f55ce78e3628bce2d6d5d43a04574fb069db74f8e257d372b7590faa61d54a1

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