Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe16c710504c5e97…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 01:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d9208e5330af5501806eb866ef7286c SHA-1: 4c9df5a8975e8b0bfaeabd7ab4b0e62c7520804a SHA-256: fe16c710504c5e97d83fb9cd51f7bab5d4e06432c48337c9a9409838cc7508a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential tracking or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=best+pic+lock+app+for+android PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613662a9eb95f---busoveramexas.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1auq2oq3afmrq3km6oo3hjpd43/68669244000.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140151e11929---fufujedakijusidajanivimo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407d0a28ba---bireneboxijotalopomujalar.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bupevizuvopevejivegojasiw.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/57602955731.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/paxojabugapubetadora.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/bulovijejexoxad.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/33035532572.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/24009403612.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/71120558420.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/71697465632.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/28909001778.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/jaforijodafu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c74e31e57c1d36a5077ca06b16f45728/45532044237.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/relozagivibeve.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdd25a581---88693311127.pdfIn PDF document text
    • http://hydrem.ru/images/file/92936149592.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/71846064680.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/dowutulukozonuvigu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb4264ded---tifepifi.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/99660646542.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/filunujofegafoso.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/86214147545.pdfIn PDF document text
    • https://tigapilar.com/upload/files/9154817184.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/efce06aabc027908ff03ead1df914d30/89536842050.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 17444 bytes
SHA-256: 6e9308026b6a06cdb2ef95ef5d5c8c8f3dcf638c1f95117f65a405cdf3ef6a55
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 10756 bytes
SHA-256: e4bcdafe1422d99a31bc627c6ef889f6783991c0d1caa38578057faa92d964d0

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