Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f9a0e94b36ab61…

MALICIOUS

PDF

92.8 KB Created: 2021-08-11 21:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a06e36fef4baf3d76341d3fc3d177750 SHA-1: cba2a55d8e20f0cd8775852354ed1bb53019a62c SHA-256: d7f9a0e94b36ab61965a214771ae2f25bfe159b45cfb634ce848db958d65e377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of link farms on disposable hosting and compromised CMS uploads indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=como+fa%C3%A7o+para+ninguem+ver+minhas+fotos+no+facebook PDF link annotation
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/8bpcquqbchsq72icgq49hadr46/rabaxi.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/39125081191.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1eb090b3---xuzotakewuxevadav.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/pajotenasurolux.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8fcd6557e11fb014a28ecf91559c9685/27658298631.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd31217db5---gepegevun.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b9b0e583c---nitufeponupugure.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/lupojako.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429133627962586.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/90225543914.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8a62b7ae0421378e9b9a946b7598f3c8/rezivikufa.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6d3847fe---64064835481.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3c258005dca9c30f5dc8b85ab0fd138e/lumesuxu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f7pb90g86gddiel34u53hifk0f/2078878440.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/35843185703.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/niliraribexure.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/rovuzovubozepamavaximon.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m8dljj0i70dbnuiuajtpp0unh6/fupasuluwe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1530ee83---wufovunifamuwiwifibet.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/94773122086.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/diwozililezupelolojikidi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea28fb325b---86889206898.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_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 11508 bytes
SHA-256: da8443ee0729a683dcbc0b77afc0f68957dc6157ae4b4fd9b7c27098972bb934
font_01_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 19428 bytes
SHA-256: 47691f25c9ab40c1d56c988bd1302b98537c703ec529fa864442d3823f37931c
font_02_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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