Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9369fd70397a80…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 23:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a64f0373afedf71b84be3b3b9241d507 SHA-1: d459b41b7f8b2a157bbf58c198518afc01676bdd SHA-256: 8c9369fd70397a800410606915efd1e3ee3f02df1f43093cf3eef9f6edb19760
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of multiple compromised CMS upload links and disposable hosting points to a deliberate effort to obscure the final destination.

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://pistant.ru/uplcv?utm_term=fruit+blast+friends+mod+apk PDF link annotation
    • https://zoldlaptop.hu/ckfinder/userfiles/files/23430071759.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/wazexinazalejimejexelu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e72ad7008---suveduzuvuxomobuvaguf.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/lojowevu.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/37152991002.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/61084921193.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/73094998586.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/xutepejebitizumef.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/todexigekemutirazepinuxef.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/44713586857.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/tm9uohe371l47jodurcpj85i06/17102483630.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/25415426422.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/9214929760.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/fojajuravojinujuxepefa.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/92071112804.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/vozugexolokol.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bbfa5e6419aee9646c7bd62e0257d4b8/fotalebo.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/dewaroxizaj.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/3584786232.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/15171417293.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/wesifidodeposu.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/niwavag.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/tenoxelikaxux.pdfIn PDF document text
    • https://carlojans.com/cms/file/48292861789.pdfIn PDF document text
    • https://ka-base.no/images_content/file/50448850229.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_off0000d83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83C 16808 bytes
SHA-256: cda4d569c02cb38c61fd87e3f1a49df7f2c1fd739ca8e4409eae7ed70fddef4f
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 10968 bytes
SHA-256: a820466f4c063860d84c4db1a214a46c0a2f1ee87718dc53c01b2cd78c90ced7
font_02_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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