Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fb98db6dcd4a86…

MALICIOUS

PDF

78.8 KB Created: 2021-06-28 07:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 01c45b45218deba7cae728e9509d0979 SHA-1: 1ec1153a040ab8e9d4c9466c2106bf22b1ee54c2 SHA-256: d6fb98db6dcd4a864dd509a317053443fca9ea10f76969af0da2fd21b1fe5b2b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ccsl.asia/files/94728208968.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6ko2mjgj94fm5he13i93r6uf5i/zowov.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/wosuxuxafowuderaxefivesu.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/24516376092.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/defulfe0t7uppjscgvves5da62/jekoze.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/zifawaziwesosunar.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/kubifaduwasigazidodagutit.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/vakoz.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/14977654159.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846c20afc6b---raxopovasipipesugus.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/64c70fe191d57177876c04be176906ec/labifigak.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/fogunaxi.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/8620741942.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/58300617075.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609496f410dc0---82569294674.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607daaad60573---guvegipetizogetid.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/itd02mkv09qbi9e3lrr06qcth2/xalad.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b7a12ab30---63952816413.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886d5e0fc3---5585002822.pdfIn PDF document text
    • https://mmszke.hu/files/file/24202549070.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32d6a8ee3---22125804922.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7bdd096c1---39595143806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=small+letters+a+to+z+writingPDF 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_off0000d290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD290 16620 bytes
SHA-256: 60317836c94282a1b4eca71a6ac189b0c3c7f958c0a20a0c8a5d59d60a9f2b5e
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 10672 bytes
SHA-256: 8e2d0a23c0b2d264e8cd2002d12680a4c91b1b706164bbe793d8f5c7fa015e72

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