Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b87fae504b9a02…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 18:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01440b7dfe5be032db65de9b95e27ea7 SHA-1: e87ae85315e3151b2513d47b2e47098341a60104 SHA-256: 18b87fae504b9a02c5933c151e5ae01a9f0d115c3964e83d4c18f6f949e9f179
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting. This indicates the document is likely part of a phishing campaign or a malicious redirection chain designed to lead users to harmful content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=kof+2012+apk+mod
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/77276692860.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/422eabb0b4df2b0255795b80521bea03/begevule.pdf
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sulozugisu.pdf
    • http://delfosventures.com/userfiles/files/51571649250.pdf
    • http://autostyle-japan.com/js/upload/files/91841684834.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/75449134312.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/37929785063.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/89cb1a1aa562b10696b64bb8ed65c3da/xafavobakevurigebuxeposab.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/80749181575.pdf
    • https://vatlieutaphu.com/upload/files/97545986551.pdf
    • http://emannsltd.com/userfiles/82343452782.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/85954443577.pdf
    • http://nadafashionbelt.com/Uploads/file/4346078375.pdf
    • http://timeyear-v.com/userfiles/file/maxikadupepokogadelewu.pdf
    • https://vialivonica.eu/userfiles/files/simalifigomolazepe.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/62477304919.pdf
    • http://zhxndl.com/uploadfiles/files/gojivurujebaxemut.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303aff4f2c9---bijitarowixufukavudus.pdf
    • http://packturf.fr/files/terefelesirefagetazuvi.pdf
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/vadinumoranudel.pdf
    • http://madmojo.com/fckupload/file/mekasipekibutem.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/nusemakabefubalar.pdf
    • http://beta-rc.com/upload/files/196311750.pdf
    • http://rentator.com/uploades/fckeditorfile/zevirojuwobegexutepuno.pdf
    • http://pphu-joanna.pl/fckpliki/file/xomonijus.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf0f3c6ea---56937115323.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_off0000ca8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 16792 bytes
font_01_sfnt_off0000e2a1.bin
9270dce8e075e1e1b3e35393cf4d864e69625af160f6a3dd54120953735e230b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10296 bytes
font_02_sfnt_off0000f9de.bin
9686a72b5e606791666fccf1b8886b7d1da464a2721760c8c8293de82b8edb2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 18456 bytes