Malicious PDF — malware analysis report

Static analysis result for SHA-256 a846e1771487e709…

MALICIOUS

PDF

91.5 KB Created: 2021-06-22 12:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9696532c3d7a9b5dbea9b0e52baed6f6 SHA-1: 90edb36823c053fbc55f949d21983343e1e84f17 SHA-256: a846e1771487e709d93f65ca8fe73331073402071ed36652d4908390d7fb7f87
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate an attempt to exploit users through deceptive links.

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://huntic.ru/uplcv?utm_term=aussie+pyrenees+puppies PDF link annotation
    • http://icsbc.ru/fuploader//file/79349739446.pdfIn PDF document text
    • https://tomas-music.com/contents//files/gazipidugaw.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/zupiwor.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9d8c346a52874270396e12d17a8ff19c/61649717790.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/6093803de12c764641de32f5cead8f1b/pikagepe.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/8406980718.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/romogoxopuzukinesutona.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/20507030342.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc2cb0811---37551364296.pdfIn PDF document text
    • http://candientuvibra.com/images/file/bizuvanufufulugubumunuje.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088284665603---48512017380.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/16cqc2bosrvt4n0rd5p1av64r2/3800550355.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/ketimefowi.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c708bcdaf8---luwesekokakeko.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9705e1e31af0a95fa3927d7942a51215/wabejabemanosak.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608276b83692a---83235716664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 4664 bytes
SHA-256: 89dd67e3378c509dba7d4c34a44ce679623633076109f4a07e2c824e9a95d062
font_01_sfnt_off00013bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD8 10640 bytes
SHA-256: 8aa29c4a1fba3e84d6f5bdffbdd71b0c9e1569c70fe7d248535febbb95590ffa