Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9b7e6139562dc5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 08:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3316a6a81d993ffd82dde2e7bb7c8c5 SHA-1: a8e7731ff94f8c94ea7033af57c8811575c17a5b SHA-256: 2d9b7e6139562dc5cf8883a63a75a8712bd04f06aaaa759c01be91137ff46952
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=unique+notification+sounds+android PDF link annotation
    • https://pristineleather.com/userfiles/file/bimafajozixafilejoze.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/fijakabikix.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/mulofewukor.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/89bcefc5f72af3d1f9697817138b0e4c/kebukisowizape.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/buripimunebitizajovem.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/31851836139.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/fizemivogigujakifiruronel.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc8b22704---dewugenazemavetufutuser.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bf02593c---37137921391.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/75594263855.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/noxefobolafafes.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/binodemobes.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd8728948---56010327281.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/runepidof.pdfIn PDF document text
    • https://ghnservizi.com/file/60485228416.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/teninisizetim.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/35897056050.pdfIn PDF document text
    • http://agmapure.com/upload/files/75480010282.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/nanupatopebaximuliz.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2ddaf69e063f98c742e762fb60f4bf0d/dixasuwuduf.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/4385115063.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dedareluvafuwomobe.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/zetufikamumefamirej.pdfIn PDF document text
    • 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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 18752 bytes
SHA-256: f372aea7d9eb5ae243248cdb2ee01a27527b42205b90a8e1aad5103a00c1bbfb
font_01_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 10676 bytes
SHA-256: 0ea962da6bd47f916bc7fe8f61b5072230b8959e1c91bb626f0c14f5aec7d9d1
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1