Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01550fb2124a2c4…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: daeee2407483a1824f2a60fccc46641d SHA-1: 928a99e3ad2e82b3de687c5b90fdce0b8a3e23cf SHA-256: f01550fb2124a2c4a2c2077cae858436c5dc13ccbb8a72d4e81e711b5fdf07cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to other PDF documents hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bcda0d567f159216a160ee459b1bdd50/40542355544.pdf In PDF document text
    • https://asiarsolutions.com/userfiles/file/sofukewobakujifeweg.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/zefatizugumim.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/negeteperixazerirezevi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/u3dj4vo8evqoq2qo0r6qc1g208/52007098451.pdfIn PDF document text
    • http://boxethai38.comupload/file/mowejosoravotuvovotes.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/70692600272.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160714bd249c3c---tajexibakud.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80341924a---voratosalapiga.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/fajuguwabetam.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/lupazebujukunawelevim.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8a3d62mdfdftaveeml9c627ev3/12681162952.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe1122c0c---30230179819.pdfIn PDF document text
    • https://ms01bet.net/contents//files/14403160197.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/nukisuzuges.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ek2utfg9qirc6gmgbkvs2pkure/61501810012.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/19059e9355f0dbd5ac72870cb99ba788/mubesage.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/99021890602.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/tn9cnb77gvshgegl4s0bailemo/nomizugesijeselinen.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ad077f5da5740d06c4656d09e7f63ee1/mebizadapuw.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c28bc9f193c---87328281182.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/87j9naldsgd3aqj98hencqgqek/66058868480.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7d75dc45---70901949021.pdfIn PDF document text
    • https://fultoys.com/userfiles/163779917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=baby+girl+height+percentilePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 10672 bytes
SHA-256: cdd095951ff99d9a3023f456e94339f1c99477a69b97db1d7938612d4ab54856
font_01_sfnt_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 17164 bytes
SHA-256: f437dc88e4bcb8e55ef5f45f5dd82e7e488dc324d707ac322f99bd6693ec9683
font_02_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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