Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b098cfbc7f45f63…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 02:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb37239e60095e7b20e65589799d8a0e SHA-1: f6ac5880ac019d72f15cf7cc574bbf47f24617c5 SHA-256: 8b098cfbc7f45f63b195ea8ba985925ec18e94e09908e19c9f0be93be86d9016
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dbmotorbrokers.com/userfiles/file/34393572538.pdf In PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/62603899444.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zajulimevo.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/42306286095.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/ligenotiwazebitiwag.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5e0747eb0b959a78e3841351e0007ee6/nisuvigepitavuditikiji.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6lsvrb1valn128gncv518gu41r/72656267822.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/63115619212.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/79700448917.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/42661546763.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/72409736061.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0eb1e29c3---pesetapa.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/689cdf992d80eef6783c3301966f62d2/3865437282.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/76820279178.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tefafenisexib.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/v8hlv65h0l2iif3trnacgrhi76/sifaxefumezagifolizagug.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/libepuxebigoburufowut.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e58296152---lirawejimidogupomotomas.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/43322298349.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/85cf808cb6c2796f455ccbd95aeeffda/96525710500.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/96556c003b9b47088b164d6db48cee7b/83189957571.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/76547599242.pdfIn PDF document text
    • https://dcimx.com/files/lanejalebe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nq7bk7f51fo1i67dqtamhncl53/wipero.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/46583673696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=case+study+analysis+examples+pdfPDF 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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 16860 bytes
SHA-256: 8d45aba064dccb7910cbb2cae24f38a8c313da6c40d7d9aefe676dfd62475a58
font_01_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 10784 bytes
SHA-256: 06abd59a2728a1e0d38384bf8637c59f2b7abfa801a59613ed93c6a1c1c5fdd7
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.