Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6eb9743c80564fb…

MALICIOUS

PDF

85.3 KB Created: 2021-06-29 12:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0577b3c3870a1139be5e80085bc35deb SHA-1: 3512f3e4f62870f33433d450a69a601ee3a14114 SHA-256: d6eb9743c80564fbaaa31350428420d66ea61eda8aa48fdaa78fbc93de33546c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=how+to+do+a+double+space+in+word
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848f4a46b44---1117803862.pdf
    • http://alexhofford.com/temp/files/file/monodepu.pdf
    • http://chingyi.tw/userfiles/files/nawiv.pdf
    • http://ondrejkocar.cz/img/file/ranasiz.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5a2124cda31cd8f12a2ac79c4389b911/megasozedofolamejodez.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074468557bf0---46534268753.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5523ee368f859529ab098ab6acc18c12/25263224860.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608390773e21b---wukodogezoxepefuzovav.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/p705viduldcc5fahtoj6a2n9f6/17655917812.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f59b550df0---leretetowizew.pdf
    • http://cuanhomkinhtoanthang.com/media/file/pajudilubikubex.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e0534c74155acc66b238e436d578fc04/57882476864.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/369434a806e44584a104aae6c4567316/rikesupowuxalovelaxajazej.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c303b8a63---82086421574.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1ec0e8bb05035d256e9f51b73384a604/nukevumodemosa.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160930e2a9eca8---suwufala.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c65a8c60c---xeludibed.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5518de8ad---zokuzifu.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fdcc4c3a3b09a00ad0452a47b2ad8059/20386235775.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pj6shojfpc6d7nsq43cgm5n5j9/rivuzazege.pdf
    • http://folientastaturen.pl/_data/file/gedalawagaju.pdf
    • http://vasvaripalmuzeum.hu/upload/file/wibevefogitepevipevavax.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9d837b55---18189838481.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_off0000eb44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 16792 bytes
font_01_sfnt_off0001035b.bin
448c784a49f1ec0570b8281f350a7b5834de9cd00a6ff64a3c0bbed3f5781def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 10824 bytes
font_02_sfnt_off00011c38.bin
3b3f496721a2c6efbf089f2e4da7c40aac88ca0277dd4f879f1daa0379ee8b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 16872 bytes

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