Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73e519e5f7b396e…

MALICIOUS

PDF

97.4 KB Created: 2021-07-05 15:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1caf74eea9cbae58c82d8162a7b32f80 SHA-1: e8fd6498aa18fc35ffabae3925fe631915120c02 SHA-256: b73e519e5f7b396e21321423a8acadb670e78e426def85285a370a3e1a971515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=how+to+train+your+dragon+dart+plush PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/at88l0di91kobac3r26t566sai/balixolatika.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/71660329334.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea4b63809---wezevupuk.pdfIn PDF document text
    • http://palami.by/images/file/fagajirulo.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061310472773499.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62ac8e13382ba15e866dd06c761b4de3/dilakefujagozilis.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/80014571322.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f16c487380a4e4edca6033f848a8b5fb/tusoratitizok.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/tidumoxebu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160941255f1bab---38856973416.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f0c8dc3bc---xizovepagofonet.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5563d4bd5f---jikadebem.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/76143846442.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608199c5e5fb9---zuvotuna.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370623e68d---99771906419.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07aabac8ad---36688714780.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c12e3e89351cacb5abce63f6237a7d7a/89531224465.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/99972865044.pdfIn PDF document text
    • http://kotolantopeni.cz/file/datowiwinozavemajazi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bf39dd2a---lawijawek.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416ad109b2---toviwisagirikarapekuxoke.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fipigirexuxixilaj.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_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 10832 bytes
SHA-256: aa482edcd6500775e0dec26bf944c6e0b350f0e75e6deecaf06901d7a899e4b8
font_01_sfnt_off000133c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C9 16952 bytes
SHA-256: 584f12e2bb21f3b4700cb0f0d909d9dbb03b60286e553b0563310d9979cf8060
font_02_sfnt_off0001602f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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