Malicious PDF — malware analysis report

Static analysis result for SHA-256 af81e92ed410be5b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 07:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a7bb001b8ec50359535ce233cf02c20 SHA-1: de29af86a02397f6ca379b97bedced2492a5b9a1 SHA-256: af81e92ed410be5b42b5c3b597c8b9c4f114a23c7fbabb798a9dbbdf4c3350d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mb-classic-service.de/userfiles/file/8708159697.pdf In PDF document text
    • https://organicfertilizerproduction.com/d/files/61927283443.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fuwikapizaz.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/seroruvefuvuwakililoziput.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xijiba.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/lugurobizoki.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/27144130208.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/1m937qputo467gotemqd7utphm/nobivupubixiwugigomulawog.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fbpqccsqmk4csqhflku9b6i7aq/79059122571.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/bajebot.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876cea05d4d---15032766517.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/86493367817.pdfIn PDF document text
    • http://exim5.hu/_user/file/45046118665.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b99842579---41112157575.pdfIn PDF document text
    • http://m2m2design.com/userfiles/29627231008.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c1603ae817dbc3e9d3a3edb769c5a914/pukowesamujuve.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/10610922362.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/zunolipixe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ea78317df7802dce983f9113fa2e1b9d/zovirekeded.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2626e4b5c3---75819744079.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/xemusakunimakexuwegijol.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jomanumolosubazobodalu.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/koxafoxulosib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=examples+simplifying+radical+expressions+worksheetPDF 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_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 18576 bytes
SHA-256: b6ff1ef6258954c7684e0ee42e62ba02892668c98e3b01598f593e8eea040a26
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 11444 bytes
SHA-256: 08b74747e4a33de1420a19be612081499b533fe42356e2e2a571b0c461076f7c

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