Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9d7ffeb4d14abf…

MALICIOUS

PDF

80.6 KB Created: 2021-06-26 21:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1da203cfd2d5dc064603d7621e5e25b9 SHA-1: abc16d1bb7f14693c699fa944005a25a8da8d9da SHA-256: da9d7ffeb4d14abfd1d532009ea71c10d13b5847d5ea7deca167a1fea79b4a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=simians+cyborgs+and+women
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf011aa800---gagisaserubalod.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073baca50d06---zurowaripeliluwoda.pdf
    • https://topclassgreenery.nl/images/file/suviwukosobib.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/1l5mjm2tor9bpogshc9mnocpmf/fegetutokifitarabu.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c4b45441---36615141620.pdf
    • http://aggengr.com/uploads/CMS/file/neninutomakov.pdf
    • http://interface-referencement.com/userfiles/file/buwujabusil.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c92088624---88516187062.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/bebeaf44257b3859ff77ca26a3e6ba7c/kabufowovatugogovisa.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601141141590342.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7225b894a8fe85a962194d5462ec162f/padakape.pdf
    • http://wojno-stal.pl/pliki/file/73510208611.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16073795e31f41---zokewelidewekixobagapodal.pdf
    • https://planet-for-events.de/userfiles/file/8402218835.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f7412458071d8336e5454aa641e221bb/tosunagemusedewe.pdf
    • http://dzwigipoznan.pl/userfiles/file/bekudajapuxumajoxigu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/r2fbbrn3mmbn3kck7uba04pj41/62923476145.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d66c9f08---nitutepazadetomogigat.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b25a98968152004e9c00af7a10153dae/viwusegegumuxuvikiwu.pdf
    • https://plasy.com/uploads/file/63032618057.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160949cfd3baf3---wananimo.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/754a6bb14a60f0f23cf7e2547ffab359/mixoxakigiguris.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca69d5a486---menudozomixesedofiw.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e802d79a---puvez.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098653bc4780---wowar.pdf
    • 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_off0000d871.bin
b60e9cdac54d972c4b4a26bde4511f5d9e1a4088754a3d5595dddcc12b897974		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16692 bytes
font_01_sfnt_off000103d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 16792 bytes
font_02_sfnt_off00011beb.bin
9bf5ea51470a717bff70c2e749e96eab4fd033d19bbd00d543c28e033626b719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 10984 bytes

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