Malicious PDF — malware analysis report

Static analysis result for SHA-256 25547f8c848189b8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 07:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe5c3cc01f23a68155b681646318b6b2 SHA-1: 13e5ad7e3f6807ea5f21d6e23e7769f7f21e460e SHA-256: 25547f8c848189b872c1bd2e34876f9e10f20f96042121bdd509081db7e17a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, potentially disposable hosts, often with UTM parameters, which is a common tactic for phishing or distributing malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=hiraskar+book+pdf
    • http://civicwomen.com/ckfiles/files/negutozugawetepinajas.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/wamafamonodovikeme.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0205685d---19197681943.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0777246ebd737ac7817257e41e99a4c5/99542462183.pdf
    • http://neodentpetrosino.it/userfiles/files/53281205393.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/31378487441.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/jurozovipimudexowekuvu.pdf
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/feduvabalefowifudeb.pdf
    • http://architettosbaffo.com/userfiles/files/fosixijibiz.pdf
    • https://yaofangpeixun.com/upload/files/libewakomexanebovo.pdf
    • http://faradbox.pl/files/file/vuvagatoxiwokazamomo.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/38599721300.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/7302272861.pdf
    • https://novitas.ro/files/15216152883.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/10425517302.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/de8873e6ae84f3a89bacb2826fbbfe76/81272674617.pdf
    • https://clubelsendero.com/img_pag/file/76198583263.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ab95be3b677ca86ec76fa893d64024ed/dijifo.pdf
    • http://mictrogiang.com/userfiles/files/tekakininop.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/wefakek.pdf
    • http://vindindex.nl/images/uploads/33613933272.pdf
    • http://punaide.com/userfiles/files/bajunazupixisuvujumew.pdf
    • http://allgeology.ru/ckfinder/userfiles/files/rizasawaxebegisumekaxibi.pdf
    • http://hanifeugur.com/image/files/67019879099.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_off0000e08c.bin
52cb64753003368ba787ed9033cbb8a21e4b24503ffc365df61384f8f1a5c0e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 17804 bytes
font_01_sfnt_off00010e86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16792 bytes
font_02_sfnt_off0001269d.bin
d9c4d039043b69703ce2699ebe777d54d530272cdc8445d939de67ea1ff0a676
pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 10332 bytes