Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9affee812c6472a…

MALICIOUS

PDF

97.4 KB Created: 2021-10-10 13:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2006b9234cab7376829ec391356ba42c SHA-1: 8cfb0244712925704eb76552a0bfd27f6275f688 SHA-256: c9affee812c6472a1ea45a4055fa57d3aa3e6b30efde5bfdfe55cc6f8c164bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the linked sites suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://xanbiente.de/userfiles/file/46928283472.pdf In PDF document text
    • http://tv-kitchen.ru/files/files/sabikab.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hkf4kcv07c9cdnlqkkn8hblqd6/zuvomazatizijekaxakude.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/83552550035.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/verutovovavodanifelifug.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b825cdd5ab701c4037945d36ad761edf/82157183113.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/dapaxagulutisotixida.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/zufivotokovejul.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/81202393946.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/69159393070.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/zuwamosogiguvik.pdfIn PDF document text
    • http://vodnik48.ru/content/file/zupagewikirex.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c02d54c64d8a89dd961d9705754c26bf/59353705563.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/wopilubovigitomiwop.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/vunupovefodukitofuzuru.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/mifozavimevawesivowefude.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/tapedigaf.pdfIn PDF document text
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/bubezumudarulup.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/17088180649.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/zojodefobefiwemigisidiw.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/58571546520.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/20219181930223428.pdfIn PDF document text
    • https://ka-base.no/images_content/file/biseroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lucky+valley+goldfieldPDF 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_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 10512 bytes
SHA-256: f9c9bb57cbb9132f8e1a312221b5078cf2a55f5b1aef94c77e865a2780f90e8a
font_01_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D0 20820 bytes
SHA-256: 371b4e518c75261ecfdc30665968f3bfb276d7112f408eebc00424a10412f197