Malicious PDF — malware analysis report

Static analysis result for SHA-256 881424e4e9321457…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 03:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ad06cac005d7710f60d4b1e1eae5bff SHA-1: 21fc943e5cdbc3b43497dafbc49819ca5013552b SHA-256: 881424e4e9321457267b36a95566354e106f5bf019fdf9796b7da0f963246879
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, likely for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c075787cedf---sunuton.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/afbe5b73ab4734145da135c18963fe8e/gebojimozitufarisuxedij.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/lanirepejigamobawepiro.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/75112454854.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e0ebf04577f09576c8646f4375b397f7/linemobagur.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ldje86offu793ddaj6qldc8a70/26257983629.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/jajakudedagotanowube.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b0da973ac---nudixufoziwit.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/46277682644.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48898b37cf---temezusakerejuzul.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/dd61f6a2d6ae16ebaafad3d5329378e2/77059169404.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/94952724432.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/768eed1031b1b21761a19bcbb7c08491/13598743028.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5c2a03b28873ebac642daff89b72677c/40830009147.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/95592618192.pdfIn PDF document text
    • http://mamam.by/upload/File/file/74104469531.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wifuvixemosesogobuz.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b26efe81de3---80395189115.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/18421026352.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nalokemis.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dataxusakavebekug.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cb20ba31b74ba25e7d2f79445416fcc7/rebekozodexaboziwudawusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=physical+chemistry+by+samuel+glasstone+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6D 17256 bytes
SHA-256: bf8c3e7b75565ae95a119ad9a5939886a58dec3b1c5eb95c8d4ec3240ce34c31
font_01_sfnt_off0000ebae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 11424 bytes
SHA-256: 7251ced3c6e0722a04c90398e403a72f53fa7ac0f6a8146e502eea2602502967
font_02_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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