Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc81b0d76a6996a5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 20:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e549f00040cf273ce83417c95af4088 SHA-1: 59aa6a78d10ab19ffbbdfab37c7ea329a10fdc38 SHA-256: fc81b0d76a6996a52afda68352ba60baee31d6d0ce2ceee20ed2d2891f5a910e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=free+online+pdf+to+mobi+converter PDF link annotation
    • https://commonwealthsportsawards.com/userfiles/file/tominuwozom.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/416054869d385e4de9ad1b62ca6663f4/sarerav.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/tujiguguvunowafulapusezo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/52744833a46f66c7427abfb96d9f76de/zevapugepelix.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a297c0cccc6---96201615589.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a73d807fb---14444238348.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-16/20210516211936792064.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s14rsvfc06q7tp2m57iigv51f1/19729272935.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/ritinoxufizubesiwesupeti.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/79736017551.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/56527048256.pdfIn PDF document text
    • https://clubon.top/uploads/files/tatozutulajasa.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ae00f66398---98541543190.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/fulugagule.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/33485782479.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/30380421023.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161083ebaa9c71---90049928975.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607393b6a578e---43553991314.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/61464320566.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608397d1c5e3d---45672375549.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60cd9d3bc5---vivinako.pdfIn PDF document text
    • http://htygroup.com/upload/files/19217032760.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca018ee6e---wimazopibijotimoseve.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0fa4140bd3f1fc37ce2e215098a6833b/81057407230.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/jifamabil.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_off0000b47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47F 14476 bytes
SHA-256: aa4a59e1d944a15b4918d151adbc24669609163c54415426eb3ee5affa9347c4
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10632 bytes
SHA-256: e29124133dc720be1da4e3c8b3b7f3556b153e8ca0138db01677abef26a65be5
font_02_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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