Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9852d31f7e2108…

MALICIOUS

PDF

72.5 KB Created: 2021-09-08 02:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 023f7462dbfc89c3f624feec47605f2d SHA-1: 55f09729754e037adf98f41647479939b4fefe58 SHA-256: 7e9852d31f7e2108325e85418f63decba3918824cc1095ed0661ce1c54c4bdd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/60d01aa0e92a87886306380418ba7584/pudopolidijozemate.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/04a4327d17297a10c8b48f2793d39477/xajutanitobaliwoniw.pdf
    • http://usaoxin.com/userfiles/2021-5/file/18345807709.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160765e8077e5c---95654527182.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/65371855247.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1e17156306fce9da290e8a0fc62282c/49741625356.pdf
    • http://phunhai.net/upload/files/90983846200.pdf
    • http://oasis-inwaste.asia/files/file/92493588499.pdf
    • https://rmp-traueranzeigen.de/cms/files/bisepidigovozo.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/9upg95om7r60hsac5sps76tqac/ratetazirorafumes.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112044ea7995---50267949635.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f954eded8---90661355888.pdf
    • http://peak-experience-europe.com/images/blog//file/1235050444.pdf
    • http://anapro.com/ckfinder/userfiles/files/puvaxezudupavan.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmjdi1ciqhcqa2e9gjnoit2d82/5511539908.pdf
    • http://verynailscm.com/user_img/file/90511829230.pdf
    • https://dollarplus98.com/images/upload/files/33274876594.pdf
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/10959888589.pdf
    • http://www.annaleehuber.com/content_files/file/muxevi.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/82296036315.pdf
    • http://df-foundry.net/d/files/61729021423.pdf
    • http://magnumprint.ru/upload/files/55821067770.pdf
    • http://ingenermarket.ru/userfiles/66850886326.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pravastatina+farmacocinetica+y+farmacodinamia+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e7.bin
e10d831e0edc6409f72000f6ac07af944b269a2b30cf63dc3afb44f892c0aa8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 10916 bytes
font_01_sfnt_off0000d23a.bin
29524bb26c9e07a7a310d9bdd7ad4c4c9f3159dafd73bf1753343f9dbb741218
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16676 bytes
font_02_sfnt_off0000fcda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 16792 bytes