Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b461afb569b3a3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 09:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a38a9e1a92bdfb732e1503c07fdae65f SHA-1: 1f299fe29e28ca0d806fc792f77b39bd0364ed74 SHA-256: e9b461afb569b3a300450befb5545ba15be53063999c018f24310500903dc5c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=top+eleven+cheat+apk PDF link annotation
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0banuomsg757k1fsp9eq6qvd5d/jipikaporomorazanitolobo.pdfIn PDF document text
    • http://slsnn.ru/content/files/85015833963.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79106402948.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/83357148248.pdfIn PDF document text
    • http://ifap.it/images/file/14325603200.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/99473462921.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/68281756564.pdfIn PDF document text
    • http://dsraxys.com/uploads/57922111378.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/63734209323.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f34e57c8---peditifujonudo.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/7575740519.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/28186252783.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/74225479546.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614185ccb8f10---livonafumudopuze.pdfIn PDF document text
    • http://vhktn.at/images/content/files/52343324591.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/pubuwomu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/bokuraniseludabal.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/55864701578.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/dadanulizogixijadozod.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/zaredemisofuvalopepi.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/91011067014.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210917_6977E1500D594DF3.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/11966518464.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/59160765419.pdfIn PDF document text
    • https://songhong.info/userfiles/file/40411732515.pdfIn PDF document text
    • http://cutskytools.com/d/files/towuje.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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 18516 bytes
SHA-256: 901899caeeaf96af18ea28ad57ff05503ad3913ea8b3120cce15950a6806a3f1
font_01_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 10232 bytes
SHA-256: f5805726ccc0119f7e238aed5765d1c6ea913b618c4f80591afa13430f1a2bbf
font_02_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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