Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7653946588a5af…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 20:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b9ab07c7084d04de688c18105ac950a SHA-1: c9906a2992b7c7d3c1f8b85e852a6bbbe439272c SHA-256: 0f7653946588a5af3f90c2cd57042f3fb0104fea93fef2050732bc4b2606a08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=penalty+for+going+through+red+light PDF link annotation
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/5kmtja1jdnfgucnqst8979s7aq/wulome.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062112273839.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/29947465712.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3c4bpj7bv6oflb8qhtaprf77s9/pilawunagawanobe.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89887488332.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tekowemukedogetepewawov.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/48457958241.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/rodutuvefunolapobel.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/ludolivi.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/75000255939.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/nafeg.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a8538549a95---kabuxuzomafi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03014787a5---bewipoburaxukesezig.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/juremugezanudaxanikude.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607226601fcfd---werobeve.pdfIn PDF document text
    • http://topas.lt/userfiles/file/dedalunilejenuku.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f4490877---2835328249.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/lutakezufi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/eb5114942e47a136fb1a567d22820b2b/kudapirupasebiven.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bed3f4828141ee8d744822033d53df1d/mopumefasano.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aa64166bc---judefunud.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/4263092734.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/309b9ea1ab452b6cd89e8db4cd296012/mowisavipikow.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/a3126073f97240b2d0a93c67e95f3524/15862293860.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8871c00ff---xedatite.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_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 17548 bytes
SHA-256: 1839f1f4ec43dd88b20202bc9855154d79d25778086c172d3991ad58df11ef97
font_02_sfnt_off0001327f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327F 10680 bytes
SHA-256: 2c484b928beb8154fcc6fa1d4e5c0ef255963bbf3abe7710940c421cfbb19531

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