Malicious PDF — malware analysis report

Static analysis result for SHA-256 e166e0d26334a2f2…

MALICIOUS

PDF

91.4 KB Created: 2021-08-07 19:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6ecd0ce599e8b52f2bf06242378cfe3b SHA-1: f30152c33ab561d406f4db1effa372658531b846 SHA-256: e166e0d26334a2f210394dbe94196587c49c5ccff8417880d9d54d6d09d61815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4a67711454142e42bd799102d1a0db87/pojavolizoz.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090337f35809---joxerojadovubemojizonej.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/geo00l971cik4tgeuhml11j3f0/95536939649.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/l5fa1mnh64i2gllsk4npbe43un/12998682864.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/rixizarubamusu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/50064598101.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9432d850a25a2053ce442deafa3ea0f9/60485904078.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/firakuruzur.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/64030482338.pdfIn PDF document text
    • http://tcihk.com/userfiles/vorejulopokadujobopapo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c7ac80544---nirovidobawaxeme.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607468cbd5648---dutarojefitejutozurate.pdfIn PDF document text
    • http://abnicum.com/files/file/68623475476.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4fe0186df---nikimobumipukulojok.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638119c474---33453432073.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107101820538920.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/94125255405.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/bb9ea4588d6ef58be46b91ff7a5f95ce/32442728088.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/63ljijr089g1jmf9aruegqhgg7/48558771399.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/mewiwugovobekari.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/9079289913.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/56868845623.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/44287957533.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5eaf986f7689aba0c5f5e63a2b7b765e/44137680467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lectura+comprensiva+para+ni%C3%B1os+de+cuarto+grado+de+primariaPDF 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_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 18544 bytes
SHA-256: 9abe671e267910f011315012a2691b98fd52c5cd9ec424b86bf390b0c7f2de52
font_02_sfnt_off000141dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 11140 bytes
SHA-256: dd74640783d4906490236ecb06c08e8ca78af993b8cc5eda33f13dc06079f666