Malicious PDF — malware analysis report

Static analysis result for SHA-256 c633a95b87f36e43…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 20:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba8a65e86716f99f0a25e846c44d4388 SHA-1: 1a255abe42dd9c252b5b5eff4a468800bdfc8316 SHA-256: c633a95b87f36e4352794fbb24fc96f4698ecdc79f505a2cc883d7e34c169d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://2sisaccount.com/userfiles/files/18196133906.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451eb8bccb8---44166358051.pdf
    • https://mkserwis.pl/userfiles/file/57564502832.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d920cc9bea---bibuponerifo.pdf
    • https://pokereshop.cz/data/file/51500995204.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16155eb8263f3b---simugupogib.pdf
    • http://gld-lining.com/user_img/files/rokoka.pdf
    • http://preciz.com/uploads/wysiwyg/files/figurexujatiniku.pdf
    • http://www.ecvbrass.ch/user/web/file/wumezaloluzepulagufajix.pdf
    • http://klaaswester.nl/img/file/mojixel.pdf
    • http://zhouzhuanx.com/v15/Upload/file/2021981629533539.pdf
    • http://sanmorales.es/userfiles/files/7024224946.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/08953f0030447260f4da48674a01bce8/64451265321.pdf
    • https://sandipkumardutta.com/ckfinder/userfiles/files/zuzebobuvimavo.pdf
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12749192520.pdf
    • http://3e3i.com/UserFiles/file///ludozitopokezupeta.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/rokapurafusuzed.pdf
    • http://kprmk.pl/userfiles/file/7427164675.pdf
    • http://hidropro.hu/upload/bisuvomadewowi.pdf
    • https://all-stage-meditation.tw/uploads/files/613afb406a1e8.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29368914393.pdf
    • https://batikatravels.com/userfiles/file/15026103605.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+movies+hd+online
    • 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_off0000b1bc.bin
ede55e283856ba7feb1dd212391a079ad19d274806972e10be7cacce36f51ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 10296 bytes
font_01_sfnt_off0000c8ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 16792 bytes
font_02_sfnt_off0000e0bf.bin
cfbce04d6c23e9100b22e56bd8415918f9f72dd406fb887ff23139268b15d2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 17180 bytes

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