Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b6bf47ad321a80…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 07:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b001e047bfa338448783f2dcfb93a83 SHA-1: a407e83f2c863d35ae047edc589d4e2217fe844e SHA-256: 86b6bf47ad321a80a53308a045ba1389c8ca73ebc41fe45c8481de72359f279a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or link farm attack pattern. The PDF structure and embedded links are consistent with attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=commentaries+on+the+laws+of+england+pdf PDF link annotation
    • https://korankertas.com/contents/files/91728934669.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/kutukaduxemur.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/daxefaliluvabu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edfbb369c0---66673988462.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/dijijanugumusipezeravob.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/sobap.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133f287ef35d---xivigixiri.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139484f8564f---52389048045.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/nozemikejajutukigedodowok.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1588c4e37dec06d1c28e33c1f0837458/52116970812.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/zokazowufetuwutekabisoj.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141848caf1ed---59337353991.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/luvazaromemet.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/mimetogaliwaximirejerasog.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jojoparusara.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/pikulagesupoda.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/22511074121.pdfIn PDF document text
    • http://linza-market.ru/upload/files/30677449422.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/ramuna.pdfIn PDF document text
    • http://egitara.com/upfiles/files/64031536152.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/68033403347.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136eb068c59a---todamosavivisirukena.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/8140471116.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_off0000c071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC071 17668 bytes
SHA-256: fe0d9cb8bb3afb48a9fdf07c46446d827bd7f066177d596851e6782b3bf2e60f
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 11060 bytes
SHA-256: 2b3c887e780fc9c33a04138cbde48de616e4f653a0b4e8ec7a0cd5879f29b077
font_02_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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