Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1927556e288fefc…

MALICIOUS

PDF

88.6 KB Created: 2021-09-07 20:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c85217cee9f7893bedff88020b67c8e SHA-1: d6102f0a7d8604e56076f05f5b4c3bee30936224 SHA-256: c1927556e288fefce5eb2bd6c8aaa8f537fe6f8c482e121829add9c94130bc9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to distribute malware. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into taking action. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5117f545ad---21176896041.pdf In PDF document text
    • https://musikkursus.dk/userfiles/file/fufepabanogefabusuzaziveg.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/kosuzadiwizede.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/20575201684.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b8aaab87d---bowezepesavikelanevituw.pdfIn PDF document text
    • http://soles2walk.cz/data/file/pibelozupugiwuzojidunewot.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e415268f89---mugomofotidagesimesaf.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec504b46bb2---47679547618.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b1ac22257---funekatezikipekisufisosi.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/43c002d86eb90af6e8ce446c22842aab/91229254805.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/fidum.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/h3k8gdkpv4c2g290f4025jt3q3/fekuxitonilizopomunaj.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e74tgpfh75fmc4c5lvqs3se8u1/54377836307.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pc6dotonbqodb0e5kl9jtpngq1/mawarepesixarenun.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/1g4acnretdkpg674es4g9i8a6e/dupafevuzo.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081813e29957---funavuji.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/kulozije.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/suvediboxuselekela.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f6eb64b8---jezazawitodujomiwi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c882f1608cb---71334345457.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/35600022011.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210606141144.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/mutodadesukopededikejokub.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/9471663287.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/279e761889554662789b8d15bfa170c3/68805937419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bouncing+check+law+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_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 18120 bytes
SHA-256: d13ee7feee3f5e26d039e173d90722d2716e11599350deb68bfdffef53219b17
font_01_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 10864 bytes
SHA-256: 380385c58c86fef55c9c8ba60709c4e9e8fd6eea1b6d1136d54feb68c43460f3
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1