Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ee8a016ff72c1b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 17:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbf177ebc3202f1bd0e07a075d750129 SHA-1: b20725e6ab15a5754136eb8e6f8afb31e2899684 SHA-256: 94ee8a016ff72c1bccf2160a9cab42c2fe544f169b2533708dbb34bfb1352ec1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=bhagavad+gita+chapter+14+pdf
    • http://decaldankinh.net/upload/files/94516876114.pdf
    • http://philipsphotographystudio.com/46271963664.pdf
    • https://innotek.vn/uploads/news_file/zelimetiguronifav.pdf
    • http://mardeestilos.es/fotos/file/bopamomabasixufafoponoz.pdf
    • http://rooptex.com/uploads/zimozaxevizuwegarirujo.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/33530191777.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b99ae0115---89427942003.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b437c8855---78680195425.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/xefexoxisojonixami.pdf
    • http://czernavendeghaz.hu/admin1/file/lugalavutilivav.pdf
    • http://joyear.com/ckfinder/userfiles/files/refejom.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613376e960129---fipirexoxe.pdf
    • http://www.ferm-matic.fr/upload/file/wamaraziligoju.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdf
    • http://fullerton.kopanramen.com/uploads/files/susezedaseto.pdf
    • http://aaas.handyfriendship.com/upload/files/73721833881.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2dc49b38---tewafamox.pdf
    • http://khonggianmang.com/upload/files/55728870841.pdf
    • http://bobas24.pl/Upload/file/mizafuv.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/117c03e6bac521298e39ce84e78ca8a7/63619611356.pdf
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/79663901858.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614251260ef78---zeridiz.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/wexizubowederivunado.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/39081757562.pdf
    • https://sikahaiphong.com/images/news/files/65006059741.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ba.bin
461377b476942dd6862ad248a8b78965a7cfa4fee4385aec21b12f8a4d718718
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 16812 bytes
font_01_sfnt_off0000ee39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 16792 bytes
font_02_sfnt_off00010650.bin
a03406950f1e40063ea8dde697da04d15021123d427758099d2f93245268e80d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 10708 bytes