Malicious PDF — malware analysis report

Static analysis result for SHA-256 291dbde7e3a62be7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 01:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c4baa444a982b176c9fcbb1be3f4345 SHA-1: a9d74f9653e96a1ddb43207d45ad1c45d33d4bf8 SHA-256: 291dbde7e3a62be7ad840313d2a34ca1508507a7d76e19a7523657b1a4b828e1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

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 https://pistant.ru/uplcv?utm_term=csm+exam+questions+pdf PDF link annotation
    • http://bobas24.pl/Upload/file/84431869050.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/93130503411.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/gokamidafir.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/76951192717.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ea2b957e---92745637238.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a11c2ca15ffabffeb29c81eb77ef3619/86006160397.pdfIn PDF document text
    • http://www.asslar.de/downloads/tifege.pdfIn PDF document text
    • http://deltools.com/userfiles/file/58839178322.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/rilivoxumegufogosuvoxulof.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l12ncvs2nqn7ispht28h0ld6v1/netekovimidew.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/bokuvebat.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/pofixazazoduxos.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pexaresugu.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210823014300.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56102998010.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c773b456d---mewuxapu.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/banowabupafasefax.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/tuvajeza.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tsib1vp935g5vnm159bcqtjrp3/98902947053.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/lexugasenuwusisudejoja.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/87208814631.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/46125460278.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b4b73a19---39233999799.pdfIn PDF document text
    • 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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 10892 bytes
SHA-256: 8ab5a9dfd01cd5d515f54369c0df5972ffd69ef346c9cd004736e31f768d77d2
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 17012 bytes
SHA-256: b79e4aaf0e9c23f7c0a6d572ca4757f86bc5b4c0d55b6bb1543b8367d773e874

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