Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ec98f4a2ff8fd4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 01:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: efc3d12e0c44479e4b1e7bd0e99b8aed SHA-1: 498a2b4f5a47613e530c2996a32a880697d43747 SHA-256: 95ec98f4a2ff8fd407e32ec739ad5760853eb64ae2f14bbeb3a658f68699206e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of embedded JavaScript, flagged by heuristics, further suggests malicious intent, likely to facilitate redirection or exploit vulnerabilities. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=game+stickman+mod+apk PDF link annotation
    • http://irvine.songhakbbq.com/uploads/files/7542686198.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/tidizom.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/xafopobukopilavixejasov.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/tanoxetoregire.pdfIn PDF document text
    • https://yasacompany.com/upload/files/tifusujigowek.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/76221721070.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a4a4da29---81056046662.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/77iaf7ib9breq9o87edccvv0sd/68944292145.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140422394530---68805418837.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba811235c7---51332223627.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/xajebanofofo.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/tixux.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/30914695343.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/bozofija.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/barabolafukop.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/60110008470.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/donenaxebo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161426598026eb---gedupiterotenexorumoxuz.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/wokejujiwudobosenu.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/6823411168.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/79721241818.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142710400dd4---32649527004.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xugunifonepurarebelezegiw.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_off0000c01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 16780 bytes
SHA-256: 7b42339ccabdd63b8375566107fe39b0454fdfb1df1fd7305ea2b7e3fe4eb95f
font_02_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 10660 bytes
SHA-256: 21f3b67ec1c52adee4f97b4817eb424449e93ef9fd5c9f5dd194662fe40e7bdc

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