Malicious PDF — malware analysis report

Static analysis result for SHA-256 2508d8ad04ad8739…

MALICIOUS

PDF

72.2 KB Created: 2021-10-02 13:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6093ec38d1a02b47d8b349fe0b2b6d57 SHA-1: 093ea73009d28566d85b518b6e2a88f793407ab2 SHA-256: 2508d8ad04ad87390ade6fc746201669417615d6424d0328cf37ccb5e4d8ba30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=carpal+tunnel+urban+dictionary
    • http://bkht.vn/userfiles/file/xekomex.pdf
    • http://citadelcaralarms.com/userfiles/file/vezadozozizosegobek.pdf
    • http://ltptech.vn/uploads/userfiles/file/muzogasuxanaxilutiwojit.pdf
    • http://ecolservizinettuno.com/userfiles/files/vokari.pdf
    • http://cottoneauto.it/userfiles/files/minoluxufuvusugamovineki.pdf
    • http://libertyquad72.fr/userfiles/file/24300962575.pdf
    • http://stylekd.ru/files/milujavureregupe.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/torejenuzuxanuxafijinob.pdf
    • http://detaycopymatbaa.com/userfiles/file/pazexatuv.pdf
    • http://pxmonastery.org/CKEdit/upload/files/60349135902.pdf
    • http://steakpluspizza.us/userfiles/file/98312413479.pdf
    • https://noddy.nu/images/file/matolafuwapelovawuzavubeb.pdf
    • http://yjccnc.com/upload/files/kokikonetebupumuburu.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4b83971b---1601192818.pdf
    • http://kodemari.info/data/files/gewinuvel.pdf
    • https://nilsahost.com/calisma2/files/uploads/lodan.pdf
    • http://cinebuzz.be/uploads/userfiles/files/gejojidefasowali.pdf
    • http://musorcentrum.hu/files/article/file/6724491070.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/bewufekutadamit.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c3f28e1e1d9a9542fa01d1585c8d5e3c/kaposodokedusap.pdf
    • https://ontech.vn/images/ckeditor/files/74360877586.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/kimokojo.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161411e26bce73---lifijakedilaziforuxixeza.pdf
    • http://shahgrp.com/uploads/70240543001.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/fofikaferoker.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b501.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB501 16792 bytes
font_01_sfnt_off0000cd13.bin
d36c6bfd7a787f22afe226239d4e43f1c5cb8dc20102054b64135fa561242490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 17928 bytes
font_02_sfnt_off0000fae0.bin
268cfdd3e0f0aac0db4e5cdc05dee3a223b3923a2cceeb5374cc3def401fd9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 10724 bytes

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