Malicious PDF — malware analysis report

Static analysis result for SHA-256 43830b60bad9758e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 07:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcd31e09013507f2b8eabf3d8f48d212 SHA-1: 5ee0e559997aeead1bdd11e265c7e77187a21e5d SHA-256: 43830b60bad9758e3693db0c2bbcc8b7d9d0da451181f4bf8ec298e48b54049b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body is heavily obfuscated and unreadable, but the overall structure and URL analysis indicate a phishing or scam attempt, likely using a lure related to downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=download+construction+simulator+2014
    • http://dongphat.net/upload/files/tudosi.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16143bf34acf60---57821219842.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/10693067234.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2cc0ec4d0df920d268632bb856bad8d7/65014550545.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ss0kpd71kaa5shkuuosl2f2ra5/zekugebumugafugag.pdf
    • https://perfecthospitals.com/FCKeditor/file/78542218743.pdf
    • http://locnuocvietmy.com/Images_upload/files/xifapo.pdf
    • http://3suntech.com/UploadFile/file/20210917120713109.pdf
    • http://nikolalepojevic5.com/multimedia/file/29914796169.pdf
    • http://onlinevay.com/upload/files/5261691517.pdf
    • https://drisraadentalcenter.com/userfiles/file/85743014365.pdf
    • http://forglory.cz/ckfinder/userfiles/files/41061661539.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/198d6d193bcbf754220ffe40a15f025c/34817540715.pdf
    • http://boardmark.com/files/file/vukixulubeva.pdf
    • https://www.ijdsir.com/ckfinder/userfiles/files/boketadugur.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631704504.pdf
    • https://russiancosta.ru/ckfinder/userfiles/files/dokodupefunisafof.pdf
    • http://efuegypt.org/userfiles/file/69862884368.pdf
    • http://88cpap.com/userfiles/files/84069320663.pdf
    • http://orenprom.com/img/account/file/53869982648.pdf
    • http://snuhonors.com/userfiles/file/kijorowujivinod.pdf
    • https://resttour.com/images/userfiles/files/tesavesimobekazof.pdf
    • http://termosystem.pl/userfiles/file/54165157854.pdf
    • http://mhzsolutionz.com/userfiles/file/bawuj.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139468784123---rexotewikedewuj.pdf
    • http://www.companyforte.com/imagenes/editor/file/felekifurapesebubini.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_off0000db64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 16792 bytes
font_01_sfnt_off0000f376.bin
919229600b40a4b5a4390321d81b4793338115078a24675c7c23a12595d93dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 18080 bytes
font_02_sfnt_off000121f3.bin
ad1b9433227978326bde717f8e28361b20cc6979c62f4ffb2e4e08124040e710
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 10960 bytes