Malicious PDF — malware analysis report

Static analysis result for SHA-256 c965306bae0bc551…

MALICIOUS

PDF

82.7 KB Created: 2021-09-22 17:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85e679fac54986add072d5eabe00e64c SHA-1: 39093816211c469627af1b8bb7c17204c78cb2ee SHA-256: c965306bae0bc5515d897dd58dba07d4480c105b3d001696c82a8b8d343324c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosts, with one URL specifically mentioning a game download, indicating a phishing or malware distribution lure. The presence of ClamAV detection and ML classification further supports its malicious nature. No scripts were extracted, but the structure suggests a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=bully+anniversary+edition+full+game+free+download+for+android PDF link annotation
    • http://sevinctekstil.com/resimler/files/zojezoxaxazipukametujij.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/75268376313.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/dosikodisupazemadikodiwo.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/lujuxanirogekemimibozopig.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/30616453537.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/nizagoterakolidatufisaga.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/73043201149.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb3e248ad---liranedafasenipipo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/nozeliwebulugogewelo.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/tusipoba.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/34183606600.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/59210094360.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/wugexexinarofu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4e47c584f---buputalukotofapisogevim.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/jukepumobo.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/rulumabag.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/49099753279.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb28b986a---jakezomidumefo.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/88496759249.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210921102433.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/23528330828.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/44336640198.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_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 11116 bytes
SHA-256: 267466a986237405b6954d50eb806e91a2cad19ca48b8d19c828d44b4286da20
font_01_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 17268 bytes
SHA-256: d5079cecc815b09e914b56c32cf577b620695a9629ca10ca123b3c17d2ce0438