Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d595da4270f8adb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 18:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2bf098c72a05a46e6128f23939700a04 SHA-1: a65399ef521694bda9e357591240c1a1e1c0c592 SHA-256: 0d595da4270f8adbb09dcde535ea0bcc71fc46b80f78f5d12c6b4af6e2b12e09
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=huckleberry+finn+oxford+bookworms+pdf PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46f547c8a---masorinebulaxov.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/10012908132.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0649b2c787---38986717477.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160818d3606401---xukeluxasazidebapu.pdfIn PDF document text
    • http://dges.in/userfiles/file/bolagezukesepovinufa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43ebb2a78---7669936369.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210625073637.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/64433680646.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f118bde8e6d8d1d97c104b4b4fe25ef7/kexupenugafutabuzedus.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076235bf25ad---48796801986.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/pimosalotufiro.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08b64746f---30244907767.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b162606e54---nuwedupawajoruxubak.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/fccc9e2887344712fc29d3f23b02dbeb/68945412288.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3fb0dd6b---10363951634.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/14884676968.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/ferami.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160de82439c815---95548706523.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/28230716813.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vuvitugos.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/77778045866.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/95209347891.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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 11144 bytes
SHA-256: 4a6e26f991d1bc54b0cd25283dc9fd64b41791cc3cd97d2ef7e4b9eec87c05cd
font_01_sfnt_off0000cb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 17152 bytes
SHA-256: ed59bda88ccca03b6c5253e666861169f77640675a893dc033404ce2ef3657e4
font_02_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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