Malicious PDF — malware analysis report

Static analysis result for SHA-256 153d35d890f9e5dc…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 09:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 576e5591f1a5813492d46c5dd3e47855 SHA-1: b5569c1ef6c3e39a81ae4d712f005859f6cab01c SHA-256: 153d35d890f9e5dc186be53f9071a88008a7e7308a227579fa65e95973523a8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://lecachet.fr/docs/files/72777719505.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zelizidibibuvexowetub.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1ae2761f9d865e29cad7c3b552d83781/mifut.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1631474329.pdf
    • http://medwin.kr/userData/board/file/dologatetumumefo.pdf
    • https://bestrecycledautoparts.net/images_i/file/72893616814.pdf
    • http://kubkao-kubpla.com/userfiles/files/67308077977.pdf
    • http://studiobonvino.com/userfiles/files/zawamotediminedagalaxe.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613024072af1f.pdf
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/lojafe.pdf
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/85431360380.pdf
    • http://pibar.tw/uploads/files/202109050711466367.pdf
    • http://turinimoti.com/assets/userfiles/file/wuvebalikawanufuruxemotam.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/78771271289.pdf
    • http://rudolphi.nu/userfiles/file/tigedemidoz.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/fenawenir.pdf
    • https://srmhomes.com/images/bulk_images/files/46233503677.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134b80100a02---nelipalakivavisiw.pdf
    • http://sunpix.ru/img/lib/file/23212072697.pdf
    • http://jiji.pgo.tw/pic/uploads/files/60369338518.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139c57e92850---tosubiforam.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/zuwakasofawixawewanubas.pdf
    • http://debten.net/UserFiles/File/61598003422.pdf
    • http://stylowa-pss.pl/userfiles/file/moladamogefi.pdf
    • http://tnshoppingbag.com/upfiles/file/62644847821.pdf
    • http://perila-vrn.ru/userfiles/file/14320750012.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tszyu+vs+morgan+live+stream
    • 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_off0000c261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC261 16792 bytes
font_01_sfnt_off0000da73.bin
a04bff3da423bd119f3401613bf6f5f4848457357915f91c7514450a6d8fa52e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 17232 bytes
font_02_sfnt_off000106f9.bin
7d33b8fb9247af9fb1d858fe9d21f4746526f6df67474ec42e3c2fc3c458133f
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 10756 bytes