Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cebc75dac347a05…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 18:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3837aae32279c221af3cca0a192a9d69 SHA-1: c38870a667bbf86ac864e4e6ee9f6b81adb602d2 SHA-256: 0cebc75dac347a051e3adfd50fb8f301daa9e5ad51032cf1bb7d063911b8d866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=freud+theory+early+childhood PDF link annotation
    • http://industrialsupplies.pk/userfiles/files/23798571447.pdfIn PDF document text
    • https://ijp2.com/contents/files/90842861741.pdfIn PDF document text
    • https://beautydent.hu/editor_up/57538421255.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/jalifumuzebumiwove.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/tujuladadevizesin.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/nirowov.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/wemokejarasisagamepuji.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/221589258.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0154abecb9c523ef785761228c1919d3/sebaw.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac84fc7e82---paxolixujep.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/viravowaditonu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/27179355d2f2ef825c7a1593de535c87/52238126896.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/rajetereruji.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/28204494270.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/kedafasibotorigadimo.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/10360345053.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368a3a4cd58---5535057435.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/67511999181.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/1696505783.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132e00917a16---13443591878.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133adffa4882---boratesipuxemetef.pdfIn PDF document text
    • http://nineslash.com/user_file/file/rerolinavejefipakewe.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/fekopunojape.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/97739086578.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 17612 bytes
SHA-256: da8afabd0f49fdeb80ffd265680d42418c8c749a2de0ac17353b7634034df052
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 10384 bytes
SHA-256: 1853e236bfc45aa1ebe45046f69d0d52296ee718bdd288eb2d40206b7bc07bf0

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