Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b46ddb85396a9c…

MALICIOUS

PDF

81.4 KB Created: 2021-08-31 19:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eeff0900cfb4f7dd4032f09e13aa1026 SHA-1: 3a8f254bd52d5908498c7fa5d34ebce9b8538269 SHA-256: 91b46ddb85396a9cf97213ebe7c5c5d980498b3a7439da4532cd7cb18e8e1584
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the document is part of a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://tano-cable.com/d/files/85871688800.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1653c68868e5f27aaf90010e56c26fa4/purotozezabusow.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/83620688722.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210725_7F829D54092DE5A1.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/04d6b3a41cdf4e860a3dbdfe2e2c896e/gegajofupopudafexaxikiv.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e281e25a9---84913640460.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dopazonapibekaselogevoku.pdfIn PDF document text
    • https://msiutilities.net/documents/78323697881.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/lilimum.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jabogozunukorotumifa.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/65612471740.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6395440fca---fexiwerofirijesokik.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1541fd88---26309195616.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/90545224500.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__611AECB85EC43.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160726504f1f2c---71796047329.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/c6jkf5u3k0n1sins6cs9m2d3bu/fakivalenifiteku.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/363b63779a3f9cc0852dc4deafbab4b7/13202258242.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/93485262930.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/5842356432.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/luvojemimasajoruzawum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=interview+questions+with+multiple+choice+answersPDF 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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 17484 bytes
SHA-256: 16aa63646fbb1482d994c2fe125fef8501d9a79cffe66a9c30ab7c56b749d9a9
font_02_sfnt_off00011e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 10988 bytes
SHA-256: 5598b74e03c14e9e8a0447c109d4b8292b5e8c5225d024cb4692bb611cb9201f

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