Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca476d46789fc4e3…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 19:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3cc9c618e0f0c1422d71c01c8e07d84 SHA-1: 0095cd8c1db774ca82d96a6b712e94d616954e03 SHA-256: ca476d46789fc4e39e928b4d9a7a34859e3004df612607f196d03e4966829a2c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://avalon-essenzen.at/userfiles/file/furoxisedopipu.pdf In PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/22272402905.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/wufigojanikopuwutoze.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/63043129904.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa198bee1---75198171255.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c949a2ee14c---jizigodiwifafoxare.pdfIn PDF document text
    • http://cuacuondaiphuc.com/upload/files/44239634477.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/51503387380.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/2eacbe069488f31ff0902380025c7fa5/29232501039.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/9888168379.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/412054798cf68163f4079bf2adda1c2d/notilibukuwavebinod.pdfIn PDF document text
    • https://marigabung.com/contents/files/kakamidajisefavoran.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f01b2f9af---bosodokivaxawixo.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/retosobesofazorowokaxerev.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/gajobotovisa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/37afc05eee6c8d2409726986797fa389/wisonexituzunitonado.pdfIn PDF document text
    • http://rapet.hu/files/1938945475.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/7cc69c1d177484b773edc20419606280/79707319278.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52e11cf7d---48808887000.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210822060438_1228668684.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/32f5a299511c6a18d747cb636f9a63e6/sunigugewupiz.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/zorepazasetimerikuz.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/62073729186.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/siker.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/waxodeduxurova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inorganic+chemistry+pdf+shriver+atkinsPDF 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_off0000be0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0C 17992 bytes
SHA-256: 677ef77b4ebb4fce796523eb01392804d6b521691a08a491e4792eada66c24e7
font_01_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 11244 bytes
SHA-256: 474d2d10a5be5aa2ce470e721209c0674149143366b82e36974c5c72a457ea61
font_02_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1