Malicious PDF — malware analysis report

Static analysis result for SHA-256 084c9663e1b05d0d…

MALICIOUS

PDF

77.9 KB Created: 2021-08-21 09:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd3fc4323ebeac20f5f0c6f25bd4cbec SHA-1: c79c0e3b688fab9acdf96584e9290cf6a938aa45 SHA-256: 084c9663e1b05d0db61ea1725c9518a1c7471dabe2df517757972b726f7408dd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=glacier+bay+toilet+seat+installation+instructions PDF link annotation
    • http://majorpropertygroup.com/userfiles/files/kujizikigipigixedulox.pdfIn PDF document text
    • https://aildf.in/userfiles/file/63206519930.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160944b45e3751---jalajebekomakixukuwa.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/gadil.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lamizomebe.pdfIn PDF document text
    • https://triosms.com/userfiles/file/xakafe.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/12303066855.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/12719492030.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5ec1968f1---56114251565.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/40762095810.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/71525200439.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/53553361196.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1lc8qmkmj25fcc3upga0vo6kpp/17301955192.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/kujibar.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/45713485615.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/22775671447.pdfIn PDF document text
    • http://fitviewer.biz/files/file/37505602977.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b906f9d1bf2009f5e37201593103829a/93912646702.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/binufumixiwera.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210624144903930761.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706863dfa08---webupawag.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b6f1c81c2f3d07ad2215a6117cd31967/gasefazexixidozobimapofej.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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 16476 bytes
SHA-256: 6865c3ffce207cefa597eeacd34c92786a57bdfe6fd0a91244e5bc963ba3374e
font_02_sfnt_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 10616 bytes
SHA-256: 8e23ea7c34240e0e6f8dc0db7db9500b93ad11ec90cfba7dc8d555b774b1bb87

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