Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdac1ffb76f89ce9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 03:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a4e19c1cdec2df9884129a3e99236f8 SHA-1: 608f64439f0e9333d12ef020fa2e416a5f8bd601 SHA-256: bdac1ffb76f89ce9c310416316b8b1df66b437b80a2fea4ee585387b02ba4335
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the document's primary purpose is to redirect users to potentially malicious content. The presence of external URI links and compromised CMS uploads further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=video+editing+app+for+pc+windows+10+download PDF link annotation
    • https://clove7.com/userfiles/file/fifirelelurenilajegasute.pdfIn PDF document text
    • http://savemaxint.com/files/file/tebonuwulis.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/32600705089.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/63180222658.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613496e1d9d10---matifawo.pdfIn PDF document text
    • http://888chji.com/userfiles/files/2564649421.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/4649234900.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/dubopebipil.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16139135d007c5---58076168883.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vufegikusopusisoduni.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/53319727494.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/80881312648.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/tedozipasomujujaxumumaje.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba207a607c---zumitukafusixadewuz.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132925e82875---kejerimogukuvaxarapero.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/81ab72ed3d6994edd244e87b3d65c89c/logunumozafowabefiwo.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/jalabufolozaxoximeduru.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411e7760451---ledesenomewetotutemo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/1510891155.pdfIn PDF document text
    • http://ashioke.com/images/library/File/ruzot.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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 17812 bytes
SHA-256: 0dae814a6f860144e525d119c1efce6b61c37230d556b0053994d59d4aff010f
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 11024 bytes
SHA-256: bad6f223d9d3f288434e15dfaaad9c5a21a161e5d5f520b44d3eabe762a6789d

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