Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc442fbe1ec9b2a…

MALICIOUS

PDF

204.1 KB Created: 2021-06-06 22:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2f95475e9311c08578d205fa70940f06 SHA-1: f6caab1a6840f0da3d83598f7a77160f1ddda1ee SHA-256: 9dc442fbe1ec9b2ae968958e74d0526b3c6675ccee1db1dd160b14b2ed30cc0b
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=the+western+heritage+since+1300+ap+edition+audiobook PDF link annotation
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3d73b253033878d6f9aaca783a86d561/zudumowezadidesare.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084746f4381b---76347737326.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/temafugaxepewatijasumiton.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892af14c7e---39816477887.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7544b5fc3---51839409246.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90822ca3a---jelodisejogematozime.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/mejimixajinudofobu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/13983686895.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe437f32a---57736694087.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/96607247977.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbe7b4574a---33165627356.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/nibabiwur.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9a8d249e---tomerajezufelo.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/78549ae1d985570442585bae7630217e/49869714805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D406 5788 bytes
SHA-256: 7163bd7b28666d73b0a86dbe471bd965da939f6eee052951b2f07689d583b570
font_01_sfnt_off0002e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E7B4 13420 bytes
SHA-256: 012fbe659d67ec8f9221e4db2dfdd12dfd503019c16c0cb203a313573d46817f
font_02_sfnt_off000313fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313FA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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