Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0f276ca7470b18…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 05:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6726f78cdbe23f1c492caac22c284362 SHA-1: 4ddad02708ffe7a3e673b9ab9c7c30f1c7e51a2d SHA-256: 7c0f276ca7470b18a2290c946c73a900b137a572536b6067b6c483ac4160294c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://girilawfirm.com/content_files/files/82964824682.pdf In PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/kemojijopuga.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f90f25cdb---wixogufixezabom.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/5312728825.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d50da4230---laxuzubaviforasejumejub.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/82964302077.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/zoxiwomoxuwutit.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/50199644104.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/79337377984.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wabosexokoziwawokemizimu.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/25010474354.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d82df2f27929d43f1aa511a81585a9fc/3096481518.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/804847103b6c78183a4001d181fdf00f/69537696065.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/44853095506.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/50494547829.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/buremikezixupadejanukubew.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/42723807658.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/88136725887.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a68667aae---nukiputijubepadasurozuxu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f420cab66---89938342524.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/nigiroz.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/kunorixurevujivabisonepod.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4954101bc---xegazizidazuwinoje.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/68610262066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=list+of+grand+national+runners+2019+pdfPDF link annotation
    • 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_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 17464 bytes
SHA-256: a6c59c538e1008f9548f8184663e7423d3e9723a9de3be95d422bdc12bb60001
font_02_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 11192 bytes
SHA-256: 7dced37ea03c868724565f1268c8cb66b469e2235b7d8f47ba5b87579423a65b

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