Malicious PDF — malware analysis report

Static analysis result for SHA-256 6639985a05fcd6e7…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 06:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d920f6303f89825ea2a66bc0143c1e3 SHA-1: 0dc5ea3ea1579f11866d343b7cf6403b2daf5578 SHA-256: 6639985a05fcd6e7e6e3c58c6ff813d43d06c85bc44abb827739cbb6c583b7ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving phishing lures or malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://crysiq.ru/uplcv?utm_term=official+guide+2021+pdf PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fuiqtau77tn7airivilcl9vj05/64251211777.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/49466659521.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd65a038---38930130977.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/27932430963.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/webizedur.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/66f0fsjq131b2a8f8e56n5nih3/56137294615.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83afd18fc---puzetipojivugod.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wavotonakepiwurujowax.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd567f2c9---43048999478.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/pukevewuxes.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e9c536d17---xeveradunukemelekafitu.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/juxatituzobuwemugepuj.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/70863472528.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b3cd273e6d604e885f92975f00d91f45/50132426771.pdfIn PDF document text
    • https://alutat.com/data/file/5834162497.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9fbd8b1cbe82265d51b331c8ce776374/jiwupipuvibe.pdfIn PDF document text
    • http://beauty214.com/uploads//files/202108070742317847.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/98312075744.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/38639128722.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c590cbad---1863544914.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/mekolazapizi.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210621133621_joy3c9.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/69465290038.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/govuda.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5e28797d6---60452550767.pdfIn PDF document text
    • http://farmina.ru/uploads/files/wasobalazika.pdfIn PDF document text
    • 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_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 10624 bytes
SHA-256: e602adb7ec4631e781f43efc76b2be7a117632110892375dc703be38b8888cbb
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 18588 bytes
SHA-256: 62d0d00b75a87669f1ed20d76a287c5bc3f47e3d1059537d30543ff1994da030

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