Malicious PDF — malware analysis report

Static analysis result for SHA-256 854b6cafb5cd9e9e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 10:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a65078c8a11ace2eb496351e454258eb SHA-1: 34d75bd884bc413f62b45d89bedf0be956f157e7 SHA-256: 854b6cafb5cd9e9e7be7f5ef3629ac68a70affa97e350c486d79918beba930ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing pages or further malware downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these indicate attempts to leverage compromised or disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://huntic.ru/uplcv?utm_term=cabbage+soup+with+sausage PDF link annotation
    • http://beloezoloto.ru/userfiles/file/43754696635.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sinovivuwevejo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6fdae94a0---55088246839.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2316e436465076b65254cb181e3c9b2f/1855678340.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/173e0d5f727c30afbc047a52ce367dd5/laralefugiforapewufer.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/m7a6f0t6cu9ncabuno46rjt8pt/15560998122.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/tarilodifutodafureb.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/89634307580.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/ketuzutoxoxujosezasilar.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/42808232783.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611b577cc68a0---nataxux.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/64257070266.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/rodemudazo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/n2dkr0i22u3tipp5lqo5lb5no7/faxanososevegi.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/jiboxizoduxudapaw.pdfIn PDF document text
    • https://biocoils.com/img/file/gifokoxug.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/91556636448.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b6321bb7---budijiwuxozova.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nutokegirafosoleroza.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/regebegidejuzawiwej.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/87210307034.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/76d9cb0754269a867cf9491416ca0679/voloxililogakused.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57957437bc---60438194607.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120b5ced8b4a---4191592236.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/37606651481.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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 17672 bytes
SHA-256: b3470b67ef2501e4ad65c26399a546c687894478b5bb8728fa224bf869dfe6ae
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 10636 bytes
SHA-256: af39dd9fa397cdc78686c0a1780de27e5b0918439be5a858640b6e72d8cc09f1

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