Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3131e72a8cf31b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 16:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4801afa5078d2e8b3e6ba21a354caada SHA-1: 6798c142822572c0e3fdbe86d24ec8f5c5e41aff SHA-256: bc3131e72a8cf31bb3e1cb5d7d23c9a81837a61c897d14675ccd5169bb64ce6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure or malware distribution vehicle. The presence of numerous links to potentially compromised websites and disposable hosting suggests an attempt to obscure the true origin and purpose of the malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tortugafilms.ca/adminfiles/file/66467990778.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60edbd0fa---vozomuxazolimaberujasi.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/xanedaxagopepuvetub.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c727dbcafc4---14982303216.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/42046842625.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/82287747601.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7345a53e9b---gunawakababobux.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d21cd9555ae---moxogujipilekobubugud.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/pojuxo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097245c1c4f7---pibul.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160737301bd03a---sobemuf.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/sikogawasokoxowiverizeze.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/miwonogewomozusab.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ae576e775---17102791171.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b955c38737---4030901228.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609de47fcb903---mufosuxodolokomazowosi.pdfIn PDF document text
    • https://belloverde.net/emailer/file/75027794645.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/rosufukilepujekifufi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/u295unaamt36vinfprusn44ct3/pinegidogo.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/12788005903.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/16257904148.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/81420032689.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f014eb667d---47862227354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=griffiths+electrodynamics+solutions+pdf+3rd+editionPDF link annotation
    • 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_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 17992 bytes
SHA-256: 5b41160ddf869c18eac66286166148f0a25ffc987c8d0573cca467643cde56ce
font_01_sfnt_off000103f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F1 11308 bytes
SHA-256: 1e9092ac0c99770d308eef10c75990e1ba9fdc481cf958993f42c64132a7bca0
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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