Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d1aef093d2f9be…

MALICIOUS

PDF

67.9 KB Created: 2021-07-28 00:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5d7f5e10f6f440059910a331b8012543 SHA-1: 8cd304dfe62e46551ad453681b95cfa7814036e0 SHA-256: 85d1aef093d2f9bea85d4b1975c39d05bc0dbd9ddc832c90fc812c5a06207490
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8561

Heuristics 5

  • 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
  • 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://damiel.eu/userfiles/file/3866320317.pdf In PDF document text
    • http://sskj.pl/userfiles/file/sumipanatevunirom.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/dazalilivavejogizepedimuj.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4c0c51289abb946c0dee058c4f383a61/77803770327.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/93031852180.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/74053501576.pdfIn PDF document text
    • http://tencanpowder.com/d/files/luvafigatovizopitedubox.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074498f65e6e---64443779624.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sugigetexadoxu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/78480169640.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/jiluk.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/ketafixitisemuboviw.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/93578924822.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/wolewuzagiw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f94fac5be---5273147195.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/werilomumutugitud.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/47901709430.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fe51b9aad---jakurevipafox.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/tugetowuvotufiritefereg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=accounting+concepts+pdf+in+sinhalaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 16600 bytes
SHA-256: ac7ad951af16d725d4960d0df6f6703547f8c47421be1501a098b01be053f466
font_01_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 10880 bytes
SHA-256: c4b879395eaa3448a2765d6f7fd4841fb806abc7d8bfa4969dd6710c51cbd006

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