Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfecd1a084e6c43…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 20:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4780ceaf001b2e82390af749d990a49b SHA-1: 761de0b896a4e265b5fbfb2d462fff8c50787d5a SHA-256: 8cfecd1a084e6c43aafec8fdb605b22d3a7047ec2bc7a82b24cc7089422c6dd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristic firings indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aymfly.com/aym_image/files/paxujobewuzodofon.pdf In PDF document text
    • https://www.karelo.com/uploads/File/27874396703.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pigurejipubeku.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/muzibatusikisuxuto.pdfIn PDF document text
    • https://novitas.ro/files/vebuvijenifewovev.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/71593641833.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/folukorajopugejamep.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/62935049882.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147ce50616b7---77942634621.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7dd759a1---10254804662.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/47248286810.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/6621509611.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c871c14284---15347045532.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/3599072952.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/gadogulabeduvunilatile.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320bfe29a7e---97357353193.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/55663408674.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9a7f3709---16290648987.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/65498019660.pdfIn PDF document text
    • http://hrudolf.com/userfiles/57248737742.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/nonamekomabunuxugoka.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/bajotabulemalapinaxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mahadev+ringtone+new+2021PDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/23363340751.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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 16704 bytes
SHA-256: 45cc7f18d6f3672de0fec11659e97aae5e9f1d0b5c98d3571ea98dd1b3698052
font_02_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 10752 bytes
SHA-256: 65934494faa7261a16678dbd6dbef81c92264b978d8ab7e40e2a0b71c8d0ade6

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