Malicious PDF — malware analysis report

Static analysis result for SHA-256 408ab63d6867b8cd…

MALICIOUS

PDF

84.1 KB Created: 2021-08-19 15:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 00a2b251b439b71e64ffd5de049c9cf6 SHA-1: 3c39c226e4d0f68ca398c8459cfafb2576b2c65e SHA-256: 408ab63d6867b8cd2e3c42c363ba2629d05ab3f717b7a6a3e19e278034d64cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, particularly those pointing to WordPress upload directories and using 'formcraft' plugins, suggest an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alexhofford.com/temp/files/file/gurirepawezepovosimulu.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0028a4dbe---nigopirevik.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/92280891795.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/kitufigubemo.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/73697475489.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607692ac26adb---xukikurobabofadodatero.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/7732715722.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/botadeworivajole.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/951b840ae3ab5b1e2e32bdfaa417eadf/31335147343.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21b949fd73---31349024308.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb0790fa32---mofunura.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/lmboa5b7cdoapbl1an7rgttf32/72941954903.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1027a5dc95---xogabagijukos.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5aa51a0c94---99713589279.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/39851151559.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zujixiropubuvaxezun.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/6204917718.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/96200916731.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/5fc077fcf0a8f9078dc0429894dc1092/4142781856.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jusakamigasidoxo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc11122bdc---depefoviwemaxes.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/suvawikut.pdfIn PDF document text
    • http://allasclub.com/campannas/file/30013090597.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd739215be---wukiluzezisugupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+cheat+at+cookie+clickerPDF link annotation
    • 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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 10224 bytes
SHA-256: cee2bb94b8307ffffc31b5ea05405b728559799e8d8de8af3018c234c8b71a54
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 19756 bytes
SHA-256: 56b5de2d135d40bdd9d81a7263824332cde2b907e8474450df1d651ca5b93bc4
font_02_sfnt_off00012819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1