Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9898bb8b719c40…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 01:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1835047e6dd3aea824795fabb13cda2 SHA-1: f5e7654dc71979b26a6134263a4328fd5b6b0a3f SHA-256: 8e9898bb8b719c405aca0b9a903792ee6a6b7c967529d18b6998c33e2ac980a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites or domains designed for SEO manipulation, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=fighting+games+download+apk PDF link annotation
    • http://lsphc.com/userfiles/file///lopamexavivitifoxuloluku.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/21709457960.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf2dd75fa---55625426484.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/firini.pdfIn PDF document text
    • http://ducnhua.com/upload/files/62462797450.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6t7l26hb22v40ctskd449eljg8/jalesatotokutagibojamid.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/75517540057.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/bugosufuwi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/12d2887ce7d645ac0f7fabb5bf805fd4/81488599424.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gagunonegazux.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/33743470933.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/geneperugarimovegoze.pdfIn PDF document text
    • https://blokhol.com/upload/files/95360172286.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/jimizogorobukifuraleletiz.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/rugonanisaborogop.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/94938041035.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e380667ecc65aca4fc03ccb1efe9f698/87890035830.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/10785731241.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/wabomopexokirevuk.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/xoganizuwisivakeju.pdfIn PDF document text
    • https://deepex.hu/hirek/files/wejevokopixugasajikawu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/wavafolivizeburojaso.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_off0000cee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 10896 bytes
SHA-256: d02b0c66e4894b24743e5619e978f61ca7b0e9a5d19b725f08c02928f7b87002
font_02_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 16772 bytes
SHA-256: f47a54553de13c4302b1b236d213ddae1fc140b481114f1ca2c885758a081cce