Malicious PDF — malware analysis report

Static analysis result for SHA-256 11df813e9d84c0e8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 06:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c67856a1ed1a959452b4b036fb4f8b6 SHA-1: 2c5441d219ef3925b6c7a3e51eb192856bd7b6c7 SHA-256: 11df813e9d84c0e88bde6fa7f5876a2270a36d076972c04108cf158421183b77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs, several of which point to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trustycctv.com/ckfinder/userfiles/files/parosovof.pdf In PDF document text
    • http://gattoneva.pl/pages/userfiles/file/jozivanuwafivatigixujij.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/nonudagananidawifepo.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902111345644.pdfIn PDF document text
    • http://iphysiology.ru/upload/zarategakagikexevukepes.pdfIn PDF document text
    • http://uteambio.com/upload/files/14662286694.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/tuxodegepe.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/rimosuluwopegonelux.pdfIn PDF document text
    • http://www.agot.pl/upload/file/pitug.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/39006824646.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/40044617861.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/78237876269.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130d61964fe7---fesiveberaxuwupelamoxolis.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a555f554---gamijipidev.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137048ae26e1---98343317768.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/35744159716.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/15603532048.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/85244915074.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/zofopekonerasira.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/18184195007.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nkqast1ds582os4ht7p1tadht7/86216237005.pdfIn PDF document text
    • http://medi-sen.com/files/files/68816476073.pdfIn PDF document text
    • http://scpt.it/userfiles/files/14483932223.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109060426181537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+bluetooth+terminal+appPDF 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_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 18164 bytes
SHA-256: ba2d8692f068d90e7d8e3909acd4819ffbb6ade992e4e6914b27a0051ddb272a
font_02_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 10708 bytes
SHA-256: 83824d3a36b4ca19bd0817fb96deceafe0c2c6dde195bb7598e0188c7ac3bccc

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