Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c447989fc45f97…

MALICIOUS

PDF

81.0 KB Created: 2021-08-20 09:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9757ab01bb5bbd4593158f6b88d05322 SHA-1: a4ff8b2035464f375a529381ce7697614a0be84c SHA-256: 79c447989fc45f974b41eb6a0d6740437fb62f98ff62f317640d00e74a175f56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cructi.ru/uplcv?utm_term=144+times+what+equals+1152 PDF link annotation
    • https://toptenstudy.com/upload/files/BodyFile__60E58F1FF2CC8.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/73273336645.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/85384879878.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6aa8cb96---79533149687.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/verowumawaxogofojenaful.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/30177320647.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d958220711219774817266144ab5fae1/vozasurakeruxewide.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4c93o1i5a6ueb43j260j29t1e6/wixazesudibanololexi.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/xolaja.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/duvozomafibox.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d3bd4b7c---ziwalumerebixede.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/30135268311.pdfIn PDF document text
    • https://istihdamhaberleri.com/upload/ckfinder/files/fixas.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c509676ae7---tivolov.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/87522710983.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b26560900a3a27c1f24b454d44575421/wesomom.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16280572272109904985.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/r1pvg82cdk1hb7kdbof8dvn78m/90689874341.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/309529267.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/98004684050.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/92708561012.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/nofifivusedigovegutawusur.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/23b55e64236633b98133bd44f11ab633/bovipakebuxep.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607848e217842---ruxafomed.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/56938017170.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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 10668 bytes
SHA-256: d332125ae983e76823e1afed4b76535b15ba04b34d140bdce7903654242091e0
font_02_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 17044 bytes
SHA-256: 691230abd2ab9157451c71f761184427b083ca43b8398e8059857923999cfec6

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