Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66515c3dfe7615b…

MALICIOUS

PDF

88.1 KB Created: 2021-08-23 19:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19e366859abdb3f7b6a3e75a2bf6dae7 SHA-1: 1780dd1c3d2c44db02809ac243fdf8bf9055c436 SHA-256: a66515c3dfe7615b4de8f40163cdcfa233691b75829524fd230b9cdbcedf1a9c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4a824cacdcfd0db0b2d69e60f42cdf88/tagemiwemaruwel.pdf In PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/64612580344.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/364bb6f894a776efb51c620380bc3867/5472841729.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/11315435513.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6hin7pbmgotrgl6c11g739p2j1/jorevoreno.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec79ca4fdf---38809162219.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607928d79b222---kevapisuzo.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/39172954835.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/tifiwari.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/dewuxikowoluwamowalipazi.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210615093136.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/lewun.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160808636b4314---saxilesanawodemab.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/xusesodojilivuluzopas.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/419vcfg0ltet57p0c7fstmq74j/8219583171.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4bd3fc35---bipikutizixebijositaf.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e84f3437---xazadojukoz.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/70982842281.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/54774269629.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8b86421f19d082658a8902edc64e9d7d/mezogole.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/81573551591.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/96926289896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=structural+analysis+questions+and+solutions+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/medemasaf.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://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_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 17052 bytes
SHA-256: 3569dcccf8d249b1df199b15f7db6880017f6f595ef5730d2803528d463e7b55
font_01_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC5 11048 bytes
SHA-256: 6bf334245d2569136a4639b8d01b2583078a52aa8af2529a9c10573c29ce603e

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