Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a918df0cb2d3171…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 02:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dae43033f881dc737da7fbf716a7770d SHA-1: db4816f0fe7ebcfd89eb9ec7e6868efc27d2e049 SHA-256: 2a918df0cb2d317107d12922c067c89976095e562cb8732f5dfc99595601de4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links are likely part of a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=use+android+as+pc PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a059f8b398---lokip.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/1589508089.pdfIn PDF document text
    • http://gestioniarmatoriali.it/3156053105.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/pekijeji.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49677955965.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/vamaxodipa.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/kikitukabinisefukonitor.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/sunugemi.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/donisix.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f86522cc---94731618502.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/81781724052.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/68344367372.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/96338339047.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8583594f---gemufolabififebejipogam.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210910111731.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hcct4erbslk0bv8d150urde2lf/15702626131.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2979d47f---sekadexopibiluxabi.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/todedujirub.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/eddc34.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa08e1ab35---beporokukivi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/67084704874.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dkdqao5a318nduckrmam51oaj9/14736016203.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/vaxutuwuseripumimumuvonup.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_off0000d416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 10368 bytes
SHA-256: 9624298acd88d6723d3d59a3595ef86163b766bd8d2a92bf76c00e2df71d72c0
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 17112 bytes
SHA-256: 1f05576573e005290227b0f589fd5dc89ced0357d83f581984cd63196af68278
font_02_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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