Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2405e10b1b974f6…

MALICIOUS

PDF

89.8 KB Created: 2021-06-29 02:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 529c10df61dd73420865eab2d2f8ad17 SHA-1: 1280039401216a795258c2f72b80c22047be8262 SHA-256: b2405e10b1b974f6fbe836035cd48ff1dc4451e65306cb20688178fedc77e01a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gemculture.com/userfiles/file/16789609407.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/q1n6mc5411pd5shmu0i0eadv44/64451937025.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c669b7e002b5e6ebe1468dcccada62f4/tejovezatilafezubenagaz.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160701c1232e48---gojexuwim.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/baxasozuzupajapudupusejo.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/57438236737.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea0aa7cdb---mulajesufunusowesa.pdf
    • https://cornwallstaffagency.com/userfiles/file/94017370040.pdf
    • http://vizugy.hu/uploads/files/35795389599.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607420b880cd6---putivakizuxobosujav.pdf
    • http://cathugo.de/res/wysiwyg/file/56573164040.pdf
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/5900fc9c6ee047a401920b0d2c0c30a8/kofozogeguresejodagafoker.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/7af208323a6fe6348735bca57e854fe8/37009425504.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/pg4etk7ir8gve3ra8o3ba6mpp0/xadija.pdf
    • http://alnoorcity.com/userfiles/file/34827809715.pdf
    • https://tosto.cl/ckfinder/userfiles/files/vaxejenaroxebel.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/64bmtujm176r9g20kheu8nmtmq/xadar.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sj0ldtfu38hr3ol1qt32hinio7/fofasokunawifaderi.pdf
    • http://work4shop.cz/userfiles/file/risibu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/aqdupua8qg26u10qe1rhkak4c4/72247235299.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca73cab2e---17804531682.pdf
    • https://gadd-asso.org/userfiles/file/bolujeb.pdf
    • http://vinaktv.com/storage/ckfinder/files/32209628696.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jbjf60egi72ue5sl3sf24odi69/41926401622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=book+of+exodus+outline
    • 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_off0000fc24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16792 bytes
font_01_sfnt_off0001143b.bin
d21c6eee57a29bb452d79528f659d1aaf24febe6819a4c8a956d52373e9edddc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 10432 bytes
font_02_sfnt_off00012c08.bin
a3aae38b30b692f29142b62948f5e87ec6c6669af95bfe5e9bf7e8ec8760c879
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 17248 bytes