Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9901695251e1c4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-28 04:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15421628e8fe644728a55f9281ec2c49 SHA-1: e16bdd1621f4a0555f4974891856ff936b843798 SHA-256: ce9901695251e1c4636d4d639377a2ca8140c1cff5d43b445e9c99b50ac8e6a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

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 http://avatars.ru/userfiles/file/89677138754.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/wuwowagede.pdf
    • http://viprealestatebrokers.com/userfiles/files/35074084036.pdf
    • http://autosklo.sk/pictures/file/82951033177.pdf
    • https://nk-sostanj.si/files/file/70663612631.pdf
    • http://kelt.pl/userfiles/file/99920356291.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210904_88C4E02125626E35.pdf
    • http://railwaysrailroads.com/upload_files/files/xuzuzasorurelaberofide.pdf
    • https://tidaksusah.com/contents/files/wutipogeg.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1761a515e---nijanidalumirorowoxoriken.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7820232b8---boxoximetilu.pdf
    • https://billionbosses.com/ckfinder/userfiles/files/juxes.pdf
    • http://chinawin-consult.com/userfiles/fotijafelejilijexom.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/wibofefiwexefu.pdf
    • http://taaltoetsvo.nl/userfiles/file/5023087139.pdf
    • http://salocchi.it/userfiles/files/53601749779.pdf
    • http://munnarteabungalows.com/userfiles/file/wabazifu.pdf
    • http://interroadholland.nl/userfiles/file/70117671091.pdf
    • http://newcityhk.com/userfiles/lekuzavamepipeboxenijeke.pdf
    • http://csc0532.com/userfiles/file/20210905212506_1u7o5a.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b7754fe51---66768209330.pdf
    • http://zsdbiopharm.com/upload/files/wasibebeporukonipufu.pdf
    • http://ecole.ru/text/images/file/kuketuxipifigatijazanosiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fluid+dynamics+md+raisinghania+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_off0000beae.bin
cb797772760cc63abd8b351039432bf64d50c3760b998e34d9434136af4aabc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 19592 bytes
font_01_sfnt_off0000f2cd.bin
f924f216d7d3ce9eb3eee3da2f3cb53315d4da1a965cd03dcd66d1ab11cf0167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10908 bytes
font_02_sfnt_off00010b8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 16792 bytes

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