Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c6d80f3c3d71ae…

MALICIOUS

PDF

81.8 KB Created: 2021-08-08 23:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 064f30f20e1b10a35bf4f36a631b5416 SHA-1: e0bac9af2772142c3f428f58b5ab3dff179691d1 SHA-256: 34c6d80f3c3d71ae29b2cdf239a8d3ac828a912cd401ba53463a3e3d8040af6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is part of a link farm pointing to compromised websites, likely to host phishing pages or further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for redirecting the user to one of the identified malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/2f6908f7f609722710e2609fecce7353/pikapem.pdf In PDF document text
    • http://irk-yoga.ru/upload/files/97286364926.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/32620828341.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/85467822174.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/favizidoniv.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb2bed4d0---48421203319.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0fc863b8---voxiji.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160981b106c413---pexoxuwoxalakow.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hp76svuq4ep7q7ilrjsk228lju/kenobomogopawog.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b31e5ea60261ce2b814dc4b6eeae72ff/xilejipolopunodako.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e77a82be4---rodumuba.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lajiduzogew.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuzititevafe.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/94241532965.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/pixelajeludi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ed79ebb2---13801408535.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/pofelapuverinegeris.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/newuvowosamu.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/bedepevufagibojigubaninod.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/51444633027.pdfIn PDF document text
    • http://xenangheli.vn/public/files/66174989209.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1018af41---jusapimesi.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/15461574944.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/97554148396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pluralidade+dos+mundos+habitados+pdfPDF 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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 18656 bytes
SHA-256: e9a3c9363cce4d29d56f33f1f19e0307cec43d59228a5536ee06bf81b2b3f9e0
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 11004 bytes
SHA-256: 791e6d347f450f63a97296b1cfbc1a899e599f16df99840095f411045704bb91

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