Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2076e52cbdc9e3…

MALICIOUS

PDF

91.1 KB Created: 2021-07-06 08:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66077a0b60b15e2ae20f92b051e2aada SHA-1: b1cdd6ad4095b4735ce0910fe17cf65ccac669f8 SHA-256: 6f2076e52cbdc9e3ecd01fa37e9361d49df88a5d4b46d671fda4172788a3e37b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious or phishing sites. The presence of multiple external URIs and the nature of the hosting point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868ad6d7a03---dukewegitunu.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2a329713---fanamokojefodolisi.pdf
    • https://alternativecarrepair.com/userfiles/file/47807383336.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e5304c37c---rozegikagututasasep.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6huigceuih0ppltuchcmf6iks4/nusexiwajuwufuwoku.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cabc915009---34826147952.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/p45stmu26i8bm7ereuuj18daa3/30420288948.pdf
    • http://ifa-astrologie.de/userfiles/file/taxutewivironigo.pdf
    • https://faceless.me/userfiles/files/35102721533.pdf
    • http://tokyoto.pl/UserFiles/file/13895420583.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074f735f37ff---kumeravupor.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ba1dfdd1---doruwigilevadekokizuri.pdf
    • http://happinessgown.com/upload/users/files/26626869019.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160985a2796133---gitolalutegarebanuku.pdf
    • http://hyosangjo.com/userfiles/file/20210623034859.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/266fffc9a1be814095efd90457f80c4a/sarujukipujotava.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d48555054---nenewipapozopezon.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ab41c3d8---wapala.pdf
    • http://quickvideo.nl/userfiles/file/90739962011.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3cbdb57b---6541213476.pdf
    • http://nw-line.ru/generic/uploaded/detegexi.pdf
    • http://csc0512.com/userfiles/file/20210610182419_ykzg8y.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/abeff1fb241bc6bb35c4085053dbb366/porasepujasigep.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3904a530---27714484144.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=4+queen+problem+using+backtracking
    • 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_off0001008b.bin
c94d4fa5c876a0d24421783dc99120d1b3fd62a5ed655269e16280a38a11c1d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 17404 bytes
font_01_sfnt_off00012e65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 16792 bytes
font_02_sfnt_off0001467c.bin
04421f44de8dc1a0fdf562997e08abaf9d0b32d940870ade7e917d657e17a208
pdf-font-stream PDF embedded font (sfnt) at offset 0x1467C 11176 bytes