Malicious PDF — malware analysis report

Static analysis result for SHA-256 521360cdba9bc8ec…

MALICIOUS

PDF

89.7 KB Created: 2021-06-13 14:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7bbed813eb1c529ffb1156a4be121df8 SHA-1: bc8c2df09a4b0aa04033a4821ed500092b513688 SHA-256: 521360cdba9bc8ec70b08aaa9f8d61ca9ace2e8848c451348ed15e97d45253b5
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, with the document body and embedded links likely serving as a lure to these untrusted sites. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=percy+jackson+the+lightning+thief+chapter+8 PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4fa2d4fe5fa840420157f763ca480a96/kareramibotelumufelafakol.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/15157825100.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/93778444396.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609de2364d295---pevusipezelivono.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d184135a6f---34483168735.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f3ea2f94d7b250d8796e2b621c1d3f4c/22952644119.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cle4u6de55bteioc8ha695s3lj/gidikepesa.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d123b787a9---zodojubanadoliwivefisun.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/138lvo6htp7gg88a87qped4r97/xuxexuxisusiguwazagosim.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf43195b6---retididesiza.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ddiaag3d7nijrn26dfp06gld67/gutezifulosel.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/vogasodadiwexularatog.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_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 5712 bytes
SHA-256: 73ebc6526be6f0c0a5e1686e3c532f9b3ef701d6e4fb9dfcd125c94d6b2ab3ea
font_01_sfnt_off00013507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13507 10292 bytes
SHA-256: 06e4be80cfd1fded0d68414b3c7793964843d3cd203414865efd873e37c87d1d

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