Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd3a553a19b3d95…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 02:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b51dceecd572ae30b49984b874d9af2b SHA-1: b7106839304090a7a0e1056a63b9bf53b8784ec3 SHA-256: bcd3a553a19b3d950fe9f51df1b27a5c98d2cdb5b98ff7abce54d843008d4e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=2016+toyota+tundra+1794+edition+owners+manual PDF link annotation
    • http://keystoparadise.com/userfiles/files/zipiruzimekukabariwoweton.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/43206360268.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/fituxivapezu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2b7ce249be7f1727ea45eb59e2546512/43027520736.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/dvcttg048es69biitten1nr5da/24585424543.pdfIn PDF document text
    • https://anaksemut.com/contents/files/25437721.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/3a5b81fbb656b42fe1030a438d2b648d/42228643309.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/welaxumukimipax.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/sijosalali.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5494b6bef6---rupodipuwemigolozovonuwu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/62333337547.pdfIn PDF document text
    • http://zatacorp.com/upload/files/87645209278.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/bajivujip.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/04150033b0c44c9db3aab5fc2c86d843/32977778288.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/jabudoj.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/bowobodazuvotara.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/puxokegipidek.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/62453988846.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/79834928673.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6ots4a5hoqiso35b33nmj2oldo/mufaxerezawonazozerapabe.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4bd59c886ba72f4113514c7c6be71d68/51916956620.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c744993398---lobuwusogojemilos.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d54484559ce9397639f770095462ef95/11702999441.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_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11368 bytes
SHA-256: b43ae955c2185e07ee87e65467fab812ca6c95ebfb7184693fdd818e8ccf27a8
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 20124 bytes
SHA-256: 574442053c6bc39319ea584194f1bb4a81ba3036c5f9e2cad4a77efe1d08250f
font_02_sfnt_off00014145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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