Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a873d0fd214c7a5…

MALICIOUS

PDF

81.1 KB Created: 2021-08-18 04:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41f22749967c71546e58d5f643e31559 SHA-1: 866f7e1e3fdaf984269a3b3250a36738592505ad SHA-256: 5a873d0fd214c7a59a3d3f70b9f7d644a01ac025cef7cdb471b66d0a51ec9a98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=abeka+phonics+charts+pdf PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1a5e5da9496b83f3e135e9f98e4baba8/96762696535.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/43676948174.pdfIn PDF document text
    • https://kristinanamaste.eu/files/ropudotenegotapam.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/76377563084.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b179e2bf---66021299096.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d0b1aa8a24029179c3217ee58d12d16e/dajekukujudopuvuvi.pdfIn PDF document text
    • https://turbooto.vn/upload/files/44730642217.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tvkl2920d2tfmhaq5b19kf6lra/givoxeminamuk.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082394b2bc85---71962136830.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kuragavu.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/73558563642.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8925592d---16207294584.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089be11d8a96---pikijexidurel.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/95892844426.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/pakixukaripega.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/25264885400.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/32441172910.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089740eee50c---46628931222.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/41385168023.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ed55e367---96532945386.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/sogulafowomebasewebeje.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa034c81e2---fuguxatitilu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/rowatepatawa.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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 10884 bytes
SHA-256: 2035c30a77c729acfdc27b50a2312636b10ffde4013da42e2714ddea1d98a46e
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 17348 bytes
SHA-256: 493bdd9fec8f3bfb865f3589ac4c9c5439c4eb7292c3288ccccaf606ebf99ba3

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