Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6de6af1f73e4d6…

MALICIOUS

PDF

93.3 KB Created: 2021-07-05 09:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5679bd4d252280d374d4463f266766f4 SHA-1: 56ab3e050a4f5e7d5bb697aed3ac6b5b69db71ed SHA-256: 4b6de6af1f73e4d638f0b563b274c24679a355591d3d7ef3988217ac6ff12f84
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2524819bc---63438342841.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0562c264d1---33894916546.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0223d9907d---xikej.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/taxilux.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ed0a4c85---ritujox.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/96895901111.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b7ca2abd---84006858473.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/13936829934.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/oj2ut4njrosip2tmg0s9u3tqc4/tosagiluxajoxe.pdfIn PDF document text
    • https://bamor.org/userfiles/file/wexubusipikusokolinirevew.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ar32553e5luo8fd8bo2el91i42/xanidepuvolozerelox.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a033d76152b3cc0b2d4fe758d1c6a11b/wenositunafigejukib.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/12733696548.pdfIn PDF document text
    • http://azizolace.cz/images/file/lidofategizisozuxifawiza.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/wobedokidodep.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/sovibowarigirimufeferasix.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd99a6ad5---28208248326.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/xovovogelirumabexe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/31cnisb35v8l82vntg2jbu99t3/56513885165.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/31783120490.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ff413c7f1da34a370c767749f03ef65f/juforij.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723687db48e---mejuwixolijatoxebitononid.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/52926861460.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/13165927335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+last+hours+chain+of+thornsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10496 bytes
SHA-256: 9bcb9f3148999a46d64fdea82a8e504f4519e34e4c227594ea29a9dfc46d87a4
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 17884 bytes
SHA-256: b3c096493d1afeb1876c87af7b07bd9abc8988c010a2783b15b49f57c82c10c4
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001501c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501C 16952 bytes
SHA-256: 8b6888ee7961a39c89f749d7600237cf816b577e33d38b9a103eb95be69cdfff

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