Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9411abf448a34f…

MALICIOUS

PDF

73.8 KB Created: 2021-06-25 20:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2c44548c5217df4e7e543fe5491316e SHA-1: 71c0113f68f638e461a7bd0ee95761dc1689a322 SHA-256: ad9411abf448a34f8b8ff0a9a4e7f36f4bedc94acfc0d74b79253a3dbda8eec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using link farms on disposable or compromised hosting to obscure the final destination. No scripts were extracted, but the overall structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=another+word+secret PDF link annotation
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a518da41a---38230352714.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7ab54ca545194cfbf33abf2e631cb762/75104477693.pdfIn PDF document text
    • http://boldogelet.hu/media/79976538317.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59115914563.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hl9q6k0k7pre1v896nkpkjr0lm/59918669780.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb0492196---46674823314.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077555fc027a---vamome.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a96858732c8---sirodevopadamemozowu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/41e07d5cb0fbe88084243e3431d647d7/powofuvetire.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607787e825314---94843043975.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/badivori.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/73184921095.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160987ff3bba80---foxeduzimo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ee1449dc8f596063f64cb54a29648bf2/kegudogot.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae203275c---12279390547.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/lazizazezutewizujiz.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tujujemazupujoxa.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c396ea96---76788688469.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb2a1ceda---fewerod.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210601_002738.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c4b4c636178d1cfebb1adebd41437aa0/77405757991.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a0db7ab2---85960874772.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8699a7b474a9f0eebed08e20403f3eac/80003897143.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r6hj1qqneukjoc4bqe29ee9dgr/zegaxo.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_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 15124 bytes
SHA-256: e5b75d88b6c45a01877d0e83ab4c06a19aa2dbab1eefc4fbccb6c3fba2ceedd4
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 10232 bytes
SHA-256: 88c9380cf268c3c1800101e41741be65ee7552497e17c621e9c5bb7f590fe182
font_02_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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