Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61afa3cf3ff3ae7…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 22:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 410ea385d2f4be82f4ec76b840816717 SHA-1: bc49a6241ad9f0b7c74fd202fdc8fc560e5be7f2 SHA-256: b61afa3cf3ff3ae7825d42033dc8275782f83f0cda873cb595555cc66403f5d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://coretry.ru/uplcv?utm_term=system+ui+tuner+android+7 PDF link annotation
    • https://www.puskinas.lt/ckfinder/userfiles/files/sixabumegijumigomuvowuja.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/77550690773.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/61774487498.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/70057653503.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/33686407564.pdfIn PDF document text
    • https://izr.fr/files/64731010253.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/kigebuwo.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090817043948.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/0134c820b753aa02e03e621b6abfc259/zukafumapofokire.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/zewewapadu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d21284df9---vugawumukabesefudalam.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0ffdcc571---67743560295.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/funazipukaloro.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c5781c2ee---pozenibewamafanupajada.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/buziruvasazimujapefo.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/fujog.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/72688600576.pdfIn PDF document text
    • https://kvzriu.org/images/file/98682299929.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/bazufaxufiruvuxen.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/82370169756.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/porotuwovemiliropaxuvok.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/12487015958.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/peketa.pdfIn 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_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 10704 bytes
SHA-256: c62c3e37dc1bd4f028f41adff774bb69bef153c3210d250e3211c46b489e34f7
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 16684 bytes
SHA-256: f667f174ece4f2c0fdeedf5342cb27718d0a7a6a7b19f27237b453c802b80c0d
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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