Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac6dfb27311bfc4…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 17:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 930868cadbd2db8cc967554278550168 SHA-1: f25e11000d28956a2f767b56f93d5d9c8f0e261e SHA-256: 4ac6dfb27311bfc4354187f74c0938c5f14781812b019850419e2931a9aa42c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/sewosujifolapopozeko.pdf
    • http://sacoorhealth.pt/site/upload/file/18231506694.pdf
    • https://abe-rdc.com/userfiles/file/74818324619.pdf
    • http://dioceseofniranam.org/userfiles/file/31723844256.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9babcc32f5d69b50cc13cdda6e1be32d/pipabov.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/acfdf2b206d12e18fd36164150e2cdd6/mimukel.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaff4841f41---77468106987.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16093399737c74---siwiv.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/xivamodesobubi.pdf
    • https://apskarota.org/userfiles/file/42400672726.pdf
    • http://maynenkhiinverter.com/media/ftp/file/walididunejebexo.pdf
    • http://charivne.info/images/file/duribaromuropatoliteg.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7c145c307---xilof.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/u10jgmolp8ffmn0boelsour79d/zuwujifadigeka.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd8c6ac76---18172598571.pdf
    • https://hijaulumut.com/contents//files/17768799687.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b12e1b28778---tosabikopadibivorazukuga.pdf
    • http://samafb.org/uploadfilefiles/324956893.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/pixugefesoberuja.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdc9e7019---76772228249.pdf
    • https://rainbowfurnitures.com/files/files/80485796875.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/9d0d75d4f834f5cf5490a6d6faf7de47/xakidub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=toonheads+the+lost+cartoons
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d433.bin
3e71c2eaa7c9c17df3825ef850eed4abe310134297b3f9dbdbe6361c1d1c22c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 10340 bytes
font_01_sfnt_off0000eb7a.bin
2d1640b0f440c67e781def262ebed7704f25c3f4fab6295e4a7222abcf596584
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16648 bytes
font_02_sfnt_off00011696.bin
686ce0f9e1160d2e9614920f00310ad24a1ccd4524a1ae129ccb16afa44d1495
pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 9440 bytes
font_03_sfnt_off0001343e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 16792 bytes