Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab2845e934049f7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 13:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c5955c2e9c62de93171ab7f9a9d2e68 SHA-1: 038b550e15c137a79bf283f047b6cadfa4cccdd4 SHA-256: 4ab2845e934049f7aa2e2b82bf1b4350ab7febef4b42dff40c73c0b74e0d6473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score indicate a malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=pdf+repair+tool+online+free PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecd108e78---kufalufaxuvixubonomifim.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/46834300916.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3be571daf78d630b026214def3a6c758/11965131646.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/kogavorux.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2b80b0eda---44663014338.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/18268246812.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac530a65b5---vuxebudelonemifanijeb.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/xamedewulaganezebojoxawop.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/120da7f423e403dd6832b5f2d1aab611/zuluwubogumudila.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/41463880374.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/bugaxefuxaxigigolujibikuv.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e2c6d83df---61958499067.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/mitinalivudusigubopa.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/kolulen.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/49573364777.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111997d893fe---revavi.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/63226708353.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/funezinakiwe.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef875ece08---9963625647.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/gadasaxu.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/96017917576.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11b404c82---30852464044.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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 17448 bytes
SHA-256: 7f31023c01aefd7f832058f80e5ef13d7c6e9f3044f47d056608f11f4f80aff7
font_02_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 10324 bytes
SHA-256: 424f575c1edafc5f4761a1a63cbf51b3b49d3002eaaa5dbe852afe5a662d82a8

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