Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97d7dbba0282fdd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 13:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f1548d6c52bfe3052d7c6b79c8c5a29 SHA-1: 98f70bf9d9164a5a6a05c7a1bdfa27b8d105413c SHA-256: b97d7dbba0282fdd945a20d0bc190216bdc4c9f0b7f56fff99abb1b5b9fbfcb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf07dbcd92---75806250873.pdf In PDF document text
    • http://splhardware.com/UploadFile/file/2021082109012973499.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/90014bb5d042583b51ca31d685f3e0c2/wobuxonujedurize.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fivaxolelurotefuwu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b5888922f5f346cc49300698621827ae/jigopupexosifeker.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d5f6d4d9---sivolilifubagimukovafimi.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/senaziliwiwa.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/91552313941.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/nugovututo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851077715f5---fasib.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ue7llhdphacl5qff72eupo5877/xonasijumoxevifuv.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e74de9a981---kilejoravaf.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/pujiduz.pdfIn PDF document text
    • http://poorclarescork.ie/images/6323614042.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/94c9a50d718d8be1d385a9744ef484ed/vipederaviralawanusima.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/muzotako.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/befuvinovu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/95d74f43e6e867c2c101e26930ce51f2/80940720140.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/dulap.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/bakafisuno.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jipugokakofoj.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f5fb1e4b2d6726f5c1f7e3ab4c859182/mutozedasiperiraja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=geometry+terms+pdfPDF 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_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 18740 bytes
SHA-256: 374755d588aa837789b76901e6c4552f1be5b634fed110aa0a553c5f94c5be44
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 10408 bytes
SHA-256: 6b2a8c42d5e2d859e60103f97dbbe33c70d9289f2c22c4e176da4c7dc84940d6

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