Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9e9aeb415af365…

MALICIOUS

PDF

84.2 KB Created: 2021-08-02 04:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5610fc8da54e186dae0164b343c55022 SHA-1: 60d61db445ea44cab1b48ef12618e01ef369e96e SHA-256: ab9e9aeb415af3653848b6b918fc38c806f405620c7f42440314c44f22513f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or malware. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://crewmak.ru/uplcv?utm_term=passe+compose+vs+imparfait+vs+plus+que+parfait+exercices PDF link annotation
    • http://pensjonatagat.pl/userfiles/file/80221459077.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f649b42c82d---72271129439.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5a63gdod0iflip99k9m59jhiva/fegikivux.pdfIn PDF document text
    • http://aps-mes.com/files/file/35819534902.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e957996ca5a---35874992375.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/145d2c9a0612bd7288c7e2548fc9515c/geluwiwalomezilewuwele.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/timimutojuperojibisosizig.pdfIn PDF document text
    • http://juliesfundforkids.com/clients/d/d6/d6f17a7a4e9d342a12f8f8eeddb80b2d/File/vilotebutuletuz.pdfIn PDF document text
    • https://castel.ro/userfiles/file/99244825966.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/3q5g21qlikb57ciqq6infvvsc3/newejifo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160752a3fa2d82---xonafivorogunokopadafodu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f92da380c---28664953020.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215121124535363.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b05035123d8---88494924352.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c6f45f46---tuwumesetegagemibenujag.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kmq02lug9s39h3p3fdg030pgv3/77307639328.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/volizibapuxatomawizopo.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/timesivijeku.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a0024ea6c8ecf675ec6d5ce796404a52/tuzilugidewarikim.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B2A3368A852.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94e2afed8---62524578231.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9532da85b8f44ddbebd6216e9359b0fe/rojufewajegoxa.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/67880980077.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/bekekazegas.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d07e092d77d---fasupevinoramad.pdfIn PDF document text
    • http://kgmda.com/upload/files/47996921092.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_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 19840 bytes
SHA-256: b770836ae6dba94afe8c1c03bf990236661cb29c4b8244981bc3f6d56abf561a
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 10952 bytes
SHA-256: 62263f37c621a0b7b20a1c0d40540a946c36687caf13e06f6a0cbb0898ad02a4
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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