Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd17655b0f8e4720…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 04:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d09d7c5e576c9cb2551f43b19fa3a3b SHA-1: 0b2617a9bdd5545d9cb12ed8825c783e61eb855e SHA-256: dd17655b0f8e4720f6b182d42c68bf32b193881bb80831aa22cec3b209ef71cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=ocarina+of+time+emulation PDF link annotation
    • https://indiantalentjunction.com/milan/media/12651387762.pdfIn PDF document text
    • http://podarox.ru/public/files/fegigu.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/feroliliridonezi.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/gizeromo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dba6aeb0---78635171747.pdfIn PDF document text
    • http://portableandcool.com/files/files/xixizodumevobokerolopari.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/sujijugutexuzolef.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/59717766638.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/96804074890.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613103a3aa70a---75981798098.pdfIn PDF document text
    • http://becucci.it/userfiles/files/vusotulovivekewevud.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/08bab4b917e5e5892a4d6b4ff8f765d1/roxunakuk.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/12006844837.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/3337246112.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/83930987342.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613799701c1fa---82154026589.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/77167844271.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/57603749752.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/77818867239.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/mesuwewijavizok.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161300e29cc557---nudosodixokiduvewedenifo.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/51713621794.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/busowulufejatukasutugode.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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 18204 bytes
SHA-256: 6f71dc3be0a43bccc3e8a4f737ed24e1a5545d91e7bb5784236962964578a460
font_01_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 10452 bytes
SHA-256: 854143c7699a1d752881fb33f9785eecf9c188c5dc5800a125bcad845f256be1
font_02_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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