Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2af68671480de19…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 17:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43e087096686846ca5c46e38c1a44483 SHA-1: 820ac271a6dd71c727c548a8a59183741362e86f SHA-256: f2af68671480de199f7dd009f0fd4ec4d8edf41a1f0c88414dddb7731a4a3f6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs further supports the attack pattern of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=game+pc+for+android PDF link annotation
    • http://cec-intl.ru/app/webroot/files/file/30498026450.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c86d167185---24389584391.pdfIn PDF document text
    • http://autoandtruckrepair.net/nbloom/fckuploads/file/51299114422.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcc472b23---fidux.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc3712c923---13310391394.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/zarorulajuvun.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/fezukejodedobifelof.pdfIn PDF document text
    • http://topp.pl/_topp/file/zilowi.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/7890912726.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/sigaki.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kidepukefafuxamilit.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/ramatemet.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/45332927542.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/bufeziwobakivenu.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/11400403937.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/28390352152.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/runawofuz.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j8nmkmiahbna61lb11lqmi0abt/26306492245.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/11412645161305f763d009.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/luzuniwuxo.pdfIn PDF document text
    • https://slotpt2.com/contents/files/zarusov.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/81e3ca0c9d20438fc7ef9c97517dffb6/95841333055.pdfIn PDF document text
    • https://o-dance.com/upload/files/98954200558.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/23904724513.pdfIn PDF document text
    • http://sergeybazarov.ru/file/11922137605.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_off0000b39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39A 14776 bytes
SHA-256: 49b1507c8b34fc51854891869ef82d6c41e04645441df426ed2ebc37737a0b84
font_01_sfnt_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 10508 bytes
SHA-256: b0f43b343db04bfb1472530eaad45dcfaa6942a312fa1c36b3dfc8a3e334a96e
font_02_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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