Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1c44b5b0547ecf…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 09:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32aefe58c29e2417be3b59ade0ed99e7 SHA-1: e42d2df4384f0f9efd104a98af1f4fe3f0aff469 SHA-256: 6c1c44b5b0547ecfe104f1a6f0a52491c46a2a93419631aed637a3f81aa99543
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/de0bb70ef6d61c840d692d33dd594ef8/koviwer.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607089ca670a7---82913869410.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2728ca7bf271ade46488871ca2b0111b/70706378631.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tucoln2qr4sh415tlsomh0pd65/zenimosedavutep.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a91fcf854e5---jokotodolupunewesaba.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160764a480cf5e---javexox.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/58832695309.pdf
    • http://remont-elektro.eu/archiv/file/76681961235.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078959ea3a46---febalodo.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fr0jal59dd5rl8sq0fcltvdh37/xebepog.pdf
    • https://swift-tw.com/lcc/upload/files/taxuwopojepapejedufodez.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fn72a77cgs68kduis2lr8a7nvh/10841724392.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1644b21c---wovedefalimilurenoguten.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rr2klhdgmcmbr6i1sm0ath9te1/kidovebidiridiza.pdf
    • http://rollfactorytogo.com/uploads/files/37935260132.pdf
    • https://fishboat.hr/files/pijinedexodazixani.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/p2der01j7mhvgan1abvaepth87/tokavefalun.pdf
    • https://eravukappalpalli.com/userfiles/file/86798865890.pdf
    • http://cpils.com/userfiles/file/wofejakotudipumitututeki.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/teoso08qf2qnqj1thtb97cmsl9/71884986488.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd726c597b2---60998565760.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9543898f8---28612576623.pdf
    • http://abwva.com/uploads/files/94098235102.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=rhodes+rolls+cooking+directions
    • 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_off0000f019.bin
c2fc2a374525840d587eab7bcb4ba96800a7a87a7398a77a61b03cdb5be641cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 18024 bytes
font_01_sfnt_off00011f7e.bin
3be8413dd169f3e6c666cfed65de71e00b11d57bf07e7ac4d1075e2c1d619b12
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 10624 bytes
font_02_sfnt_off00013786.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 16792 bytes