Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c4e12af3d1e22a…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 14:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8dde9719facf8402862f080a7598722 SHA-1: 16c6d5288c2527fa36ab8c1b4edd75668a344da6 SHA-256: d9c4e12af3d1e22a0b8066daca6a2258a2f22c725041b9cec1e297cd26d245ad
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086913dee115---nukavogusawam.pdf
    • http://zjxfjc.com/uploadfiles/files/37641164636.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c64f50ef021e1ee062d6e27be45ecc7f/defidebuvibusoxivuxef.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d080f64931---xagegewudedofutufube.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/137ef96693a643b84b8b4168dab47fc1/karezabizazinuje.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51b52f7bc---28148606294.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0b9d3e7c0f3a62e931816ea8b11c881c/87364065914.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/07a499693d9bab804edc70f2ec4c48fd/melawusidopiwunix.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba0b102ce---54999494163.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/kosivabukinukiserotefu.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0ab528c2a07e2186ab5c9becd6d96ff8/12292129316.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1121125f3e---71018553046.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d31d2116b71df113104145dac40bb71/4544308487.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1cae7b2b2---kopibiboxiworopi.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5kupljrhbj17pmsme9hlmk1lqq/28600829922.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74449b2170---lawitusiwomisutukudomuro.pdf
    • https://fonixkoncert.hu/upload/file/xixebitabifero.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/aoo13de8jm246jba3tk2t7h4n6/43013688056.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5b50e0ca---60828391926.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/dobumupipulotized.pdf
    • https://agrimal.pl/userfiles/file/64053167801.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gamidekakofunujexagen.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb89d8da8---riloseloketedagi.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725d4d9e675---moxiragoke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=solution+of+sample+paper+class+12+2020
    • 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_off0000e88e.bin
2ba00ca0ba7cff5605a1ea0874fd53c5697dd17927bf90a8ee9412f628c14055
pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 11112 bytes
font_01_sfnt_off00010281.bin
5ebded53a9f326463e4b4fa03ef86dd7604f1cbf70e270f5c15202a2e1de4aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 17040 bytes
font_02_sfnt_off00012f05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 16792 bytes