Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba9bfe91a7f02a7…

MALICIOUS

PDF

82.4 KB Created: 2021-06-30 19:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7300e2b561f319d39058777e006b23e5 SHA-1: 35a111eaa60807e21f27a24ba498a58ea0947b30 SHA-256: 8ba9bfe91a7f02a7c2f2fe867b285ff4428e9a0fdb44371cd51d93900dde25ed
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec070f03f---90446205808.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16216377679744.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f4c721a98e9998ae24f79a996b0ec0c1/60919043201.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088f945b4f5d---zunefefetolariwu.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ed3601bffa7393275eb994b862dd549d/70169370332.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/46720218825.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fe8be806---63767536790.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075cff17a5d2---nijunifujolozomorul.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd8e29acd---75164699401.pdf
    • http://metallpress.ru/files/bofuxunitowu.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1947e20408---45551171293.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc71fba7b8---77076009958.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cf9818bc---zatarodupoxera.pdf
    • https://sunarchegypt.com/userfiles/file/17927625492.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/20435138571.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//26244848791.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a7210df27de5eb1e85a841b6c084be06/lutevimusotepep.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a6c4af45---peboxisitelibomagujakiweb.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/t9sbqet3d72tevoruog30i40dk/94747772217.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094be6c715e0---mamupafixoworelazuvifuv.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/puzefobawekona.pdf
    • https://alarrabnews.com/images/content/content/file/zenukirenizegigigojajusar.pdf
    • http://exhibitionchannel.com/upload/venuguvaxizupilize.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=14+inches+in+cm
    • 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_off0000e189.bin
3ae17f944b2ca514d5d533d066afee18c709ecf0e209d3c6bad8b0f070211d70
pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 10000 bytes
font_01_sfnt_off0000f77c.bin
c94f79642d2c03418bf6d6354d372fec30eb82c01cb4e73c14d8b7332fe71776
pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 17196 bytes
font_02_sfnt_off0001248c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes