Malicious PDF — malware analysis report

Static analysis result for SHA-256 3364a86aae03df25…

MALICIOUS

PDF

106.9 KB Created: 2021-08-26 21:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: df38891812c8e6f57c34e38abaa0fcdb SHA-1: ca0fc3dac77db3975ad3affac78a6b00b119e2a8 SHA-256: 3364a86aae03df2567a605bbfe3ece675f42260c4b8ced4ae596227b565dfefe
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 WordPress installations acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c3928612f---saguxote.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/caduk336bu7e9s25vdd26a9732/zepipiw.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8b297c4d73483694ad67c6abb82b454c/xanatitajesabomejo.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/zorote.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd89a7ec7---97709699768.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbba798a04---88877162939.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076579d314d0---99709350436.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/56977496215.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/1877891136.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5365653217---43222593048.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/2583587947.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2e923249---21367123742.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dfrjj2h8h8cqreo6adgn9fvb56/59933563032.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/buwevekugexoxebimudamo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166aa56313---jusodazitovonimil.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/nularabozenibi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160badb877da43---76312742907.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d687aed91---86946185154.pdfIn PDF document text
    • http://immopolignano.lu/images/67651179020.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wewudekosuwu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608316d0ef04d---20789037153.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/dab141fb225d754f588b13da8719767d/95598160387.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/69s85rmjmkab191e3b8uj5vuab/53816926859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+sign+minutes+in+aslPDF link annotation
    • 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_off00013f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 17800 bytes
SHA-256: cfd1aa41c054c6a87f5fb28c938e92a32b7f0b13ce420b317c49ed2891f3bdea
font_01_sfnt_off00016ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DED 10528 bytes
SHA-256: 5e83cfacf57005fb3bd9567b3fec7c7b5403ddcfaa7d881a5dfc1ca86de58ca8
font_02_sfnt_off000185ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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