Malicious PDF — malware analysis report

Static analysis result for SHA-256 58005492330651a3…

MALICIOUS

PDF

112.7 KB Created: 2021-09-07 09:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc7d10c24b2ff6a96cabb98123b51141 SHA-1: 308704aa5faabdd7026231d18ab40e5efdf494ec SHA-256: 58005492330651a3f386bf00d4c3913740c7ae757de17c8214f81fd9ce2cbfcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised websites and potentially disposable hosting. The document body is heavily obfuscated, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0998660a6a219a4918c560bc5976544/tagibu.pdf In PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/gesinurinivolekaporovuse.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h6on5b115fehe8blcre2s790e0/97033615603.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc66862ed---ponenijunoxemijefapewupes.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/lipudakuxusi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e08c3d12d---letuvofetapemop.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/moxamujazek.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/ligixoxorijedig.pdfIn PDF document text
    • https://uangraja.com/contents//files/gerusaguduvugonurizaram.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fke8ftkgbl99e334lgqilaitjr/wirivadikasezoxix.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/77827951369.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ilmttmhvn1f540s7bgkumo4ig7/gesawib.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/wajusafebewexer.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/87584069137.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/morulezimopafofek.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f4c34dec6d1d6dfbc60b66379bfe2b78/7806989373.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/75759386338.pdfIn PDF document text
    • https://dineflon.com//files/71030745157.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16206219631428.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/janumako.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/pizawotiroda.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606faad722857---46563754127.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086906e72b55---juzajovos.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd96e5acf---junuxidamogato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=manuale+istruzioni+epson+xp+245PDF 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_off00014e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001667c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1667C 20172 bytes
SHA-256: 814aec85007642eb966b2c60974aa294fa6f190e7c99bcc2bab0713c9de136b8
font_02_sfnt_off00019b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7A 10832 bytes
SHA-256: 727d9edd22677674cdc04abf79a334fc0f6e82f1c9c77757b95c380aabaf629d

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