Malicious PDF — malware analysis report

Static analysis result for SHA-256 778b349816d87836…

MALICIOUS

PDF

102.0 KB Created: 2021-07-16 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 579b68c93a867ad3c6fdcce62749832b SHA-1: 3b57a9ed9a8935e8c417feb949e07b45d9de4fcd SHA-256: 778b349816d878365c32b4ce5e9032bb51658e35d219798f47a194f3e40f4553
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and compromised CMS upload links indicates a pattern of distributing or hosting malicious files via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://duext.com/wp-content/plugins/super-forms/uploads/php/files/61e1ca7cd44092c653f05a3ee781941f/dexepozaduv.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ib9t55r7s0bbee86adr7n2pbs0/95199750521.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fr3fo7anbvc52g8kstgmmumqm5/fojaniritukitupixafodax.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d914f3ac4---paxiwalixorik.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/53872550620.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c4268cdad3fb569cc8b96357164216da/jukukoru.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4ae30ca0---rozojobonuzoxulikenige.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c1f98caaf---daxif.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/64457125601.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4f26f1bc316af9e40dfe76a6345b7448/lirejadumoniduvagelate.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/7552913076.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/899e70787697712bb7aaa40a5335aebe/vizodireges.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/5930576150.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/57182348177.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/47976893660.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/fugorurimafivob.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/5774625166.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebbf880942efcd308d22090f8254efcb/genojalamin.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a8cc59b8c---22318088426.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4951f5a4a4c7779f1e77f2449a5ce9e8/welinodukavoxalinezi.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/rogenapezem.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/52bsua86gr6rhhs072tmbtakd1/befawo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fde34934cf---25302306728.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/lipovetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=a+tribute+to+youPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BF 17988 bytes
SHA-256: 6893cf33cc63d667af3c08bad0b5b4293ce84b574721cbdb25bd0aead039cd0e
font_01_sfnt_off0001463a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463A 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_02_sfnt_off00015c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17437 9956 bytes
SHA-256: 5418ebdcc284354fd52ddf78d202c89debd9d8551f6b2f959b9fd1a316e6b15b