Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bef8c53a5c067…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 12:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 949750b9e1512160fa0a9df90ecd2b32 SHA-1: 7d692375711451edfc648a9fa5cc1e64788f6c38 SHA-256: cd7bef8c53a5c06756f74dcfa88b26a390de801772bb11c39061d999a2c2d938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised websites, with a high ML score and ClamAV detection confirming maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely using the 'black friday deals' lure. No scripts were extracted, but the structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7107ca10accddadb69d6ce4cdb1b76db/perigolajugesakulorap.pdf In PDF document text
    • http://telesson.net/_UploadFile/Images/file/degazofupejodanuna.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/delinogumawasodezu.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/71396648517.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/82304119276.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df94e0e89b5---53450054095.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/i6r3mcn26m2cpqgbcg9ba6fu29/43853172425.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76a0d3010---jumamufolifaxizu.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/67990682835.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22ab6816c---43254740106.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pisusixinakezewib.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3049b6236399b19d59c0fd6e0d44fb57/kunonuta.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609464bcecbb3---10540807898.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/61632780731.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/8455031225.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/83482777054.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a3a0b79d---rutewaz.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/voxemevebaralopas.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/8uud4tmr7av6op869deq32h9d2/rixonagenivaku.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/jesajusadi.pdfIn PDF document text
    • https://brod-plovdiv.com/images/vasarozurasopogitodepepat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=black+friday+deals+pdf+2018PDF 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_off0000c0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 11052 bytes
SHA-256: 48b86cf46f33c541caabd0ef44dac466b7c31129cd74e393c02992d7f3e58622
font_02_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 17540 bytes
SHA-256: 202b6d6293e47d73c29bd0fbbd3ac46f73c49e9cac8b80f930bb7d7f94092187

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