Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8100ff1cfdb94e…

MALICIOUS

PDF

81.4 KB Created: 2021-06-13 14:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f9f16d65679b0a9cc76709150ef2af72 SHA-1: ddc76653ba6e01e2f87c742c584aca7f7921277a SHA-256: 3f8100ff1cfdb94e7f9a0703fe06c936465f648a10ae9350bfa150b873aa7480
156 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 0.9998

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://smidgel.ru/uplcv?utm_term=reduction+of+lialh4 PDF link annotation
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39511873406.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa779fdc577---zigibemusuvuribitulepemed.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fiafhms6824mkc0ha58to1l3o0/86578913789.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/bipebanakemunafa.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/jitosodiliwurikuzetexo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/runejarelefazuse.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca9e7b588---xeritukuzisab.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/keguzubinuxox.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5afe3782222861c5298f0b17301ea6ab/wamipuw.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/45645420445.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2cdff4e---wejezomepotusakitudew.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5g92okag5pev9akfvdd3mi34p5/56453857935.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f284a686e63153b95825a70764535cbe/9074378530.pdfIn PDF document text
    • http://championsview.net/userimages/batimorolat.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/572e737748f5144562eac7b09fb4cb88/repetunosetosarurorulol.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/82408417874.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e95af3ee7fb53df9173562a44f3d1ef1/19394012746.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_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 4812 bytes
SHA-256: 617328d1f5dc53e2bfc1572c42f1f29d87c354f12c01589f3ebac6c45255d623
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 11516 bytes
SHA-256: 9e5e3105ab4c35afb951288797c9cf526a05e7c4aa290c0edcc26528ab46e17c
font_02_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e