Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7692321f80d6c8c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 09:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c16ca8fd5f21846e401214bb9081fa6 SHA-1: bcfad36f336a3190dc9be42d1ab7f18e1d79a6e0 SHA-256: f7692321f80d6c8c8c9ad4a480781ec36c476e56517054ffa09f33d0704dd0f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=enid+blyton+book+of+brownies+pdf PDF link annotation
    • http://ajtoablakcentrum.com/_user/file/617887779.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e434ab5aaa---16629716007.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3e1f4e3241947d8e9e42df1f9d4bca40/ruladozeza.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/52550778709.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/lujeguxejozilokeme.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/drp81skkj70jji17iqpgp6scp7/tifuberijaladusekow.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/dumedawufibeximaliful.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a766r2o78el00rs130k5l25t92/wirisuf.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/mefuramufi.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/97817782829.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/zevorobopizob.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608da30d3bdbe---95417077051.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b908bd49ce9---kidojenalalibarapa.pdfIn PDF document text
    • http://splogservice.ru/content/files/95063403066.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/29293943282.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/52078945257.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/guwure.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/94983866543.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/3488246823.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/9123499935.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/9jpfm4pk3jse1hmoibgne3879j/zebes.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6755a6aa11dcece220a2d47a8443c20/zifudilozujasigalotuketa.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/80821459701.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/97662721957.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_off0000be6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 17436 bytes
SHA-256: 6b448a2479055af71b49f58bc12573596b41708470819aea12964c00ffe108e5
font_02_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 10744 bytes
SHA-256: 2f9f3aa185434dc54b3876f522beacbb639bff06d9a2450969f5467388902f7d

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