Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccc96608697b21e…

MALICIOUS

PDF

87.6 KB Created: 2021-06-24 10:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dabd3c81ea83e4271db9785d53579591 SHA-1: 3f366b7bacfad880b0b5a71504956e2ca1f67852 SHA-256: 1ccc96608697b21e5ba955c4d656acd2adb26ff86a4656fd75293cae3e1d6c40
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings point to a common tactic of using documents as lures to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=customs+extraction+map+2020 PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26cdda5a1---jijarovinowedexu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kipokoxi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a748e03d7bf---titomotisopo.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/p5gieerijrlauq4b153paiajmb/44398437478.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4r84a4blp8534gshk0mirjkp77/39174660419.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4c90d50a884144db9a6222a68809543c/fikurizisorixep.pdfIn PDF document text
    • https://actorconseil.com/files/file/xewakenesunibe.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9f92762b7927ee052f08c27bfd548410/lozesegegigarapem.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb38be7c4---81289929567.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607523b8d52d0---53928368538.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bbff6e3a68ae8f6be4a5df341274eba7/75683744833.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/39154510339.pdfIn PDF document text
    • https://lasanisports.com/files/86778256145.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7fc805ca2---bigobuzizaneluli.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_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 5296 bytes
SHA-256: 1f1d3f4edd87f6a3f178232cc8cad746a11ce1b69f631ff86d5d6bd11e5ca09f
font_01_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 11044 bytes
SHA-256: 6aafc41bf19de3b3f207feb4e5ce8845e5cd95c37a7c9a6d0809fc8fea1b9af8

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