Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c1f21d74c01b9b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 00:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cd70b8a56e57a1e8da0e5a877922340 SHA-1: 76baab9b11d84ab74320dfb6677d88cda5c3f9f0 SHA-256: d6c1f21d74c01b9b16859b318c67dd6d7528a90c532e1e98f994ac75e08ca0a2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF being part of a link farm hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://anakaygame.net/calisma2/files/uploads/vofusubuzudokuzizawogi.pdf In PDF document text
    • https://tradegateindia.com/userfiles/file/votufebezisimulule.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109060441493335.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/xisokokixobedigamamut.pdfIn PDF document text
    • https://izr.fr/files/davezaneloloximamoxa.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6827a391bf52096d10cd63de21402f78/nojolagagigumefopozunizur.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161309ce3586b6---babalotozif.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109062217532178.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/7591092628.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/89910052720.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tafixaralevijogu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba514c45b---xutaxuzogeropifefigibe.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/xononevupimetatevu.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/meremojumaniregamezep.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6b606c8b---pigel.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/bibikaramikubi.pdfIn PDF document text
    • http://kccmaul.com/files/files/81365103672.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/75202021074.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/2670518966.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nosiwijufusinataf.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/51811127059.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zalojowi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613180356c6ff---gegalu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/62a23b5df81e4c7a0bc8d4e726583251/20559121028.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/he2gmtt5t1a6qrvolutprct4h0/sezuzikubiberejavebanezo.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/27541162592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=browser+chrome+appPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/8837834988.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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 17996 bytes
SHA-256: 2f15a7744d0b40233168f23fb88cd5845ed38885ac7d02f513ee42f8a10979b0
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 10436 bytes
SHA-256: e2ced10c46dc3c45dcfd1e1defdab3bde3619519d9831c8532ea4ce7fd6d5560
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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