Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d890eedad50fbf…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 21:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77e2f850abf0d8d845e72e86a2e9dbbe SHA-1: 78e8fec2ee6728c54912940d9563f89a2a180239 SHA-256: 57d890eedad50fbf499e7799ecac1f8229f94b9f81a13a4f0f4dd9551e4e31f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to other PDF files hosted on compromised WordPress sites and disposable domains. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=vupoint+magic+wand+user+manual PDF link annotation
    • http://ndt-tl.ru/upload/file/sufebisinen.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/38058422119.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/e3bc1a46bf223d244038284733203fbe/52446468587.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/62519610511.pdfIn PDF document text
    • https://cartolmania.it/file/voxuzunel.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/moratilidilumodusoduj.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160705b2f57693---73482767146.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-06-24-01-04-21-HzU7AH84.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8367688b74502d90eba2e0387a615ce2/fetujuw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4pfa17rkc8b5ngs517cnuf40jt/32379498551.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5ab7884e---61682026548.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e1d5e80275e0ef133ade423819b57e3c/77007747770.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd28ddf61---2479732934.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/6db7002d6b7a321c4dd835424bd28499/92822611352.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6ab83e71e381b65115779555caf377f8/65873396047.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/644984d3833fc979dcc42b7af7b859ff/44868661631.pdfIn PDF document text
    • http://soupworld.de/upload/file/7385361524.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/puvotapujopelapilipewuxi.pdfIn PDF document text
    • http://kbchina.de/upload/90716265356.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0efedb2d---duxuduk.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/45679749148.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c2e05094---dojit.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/21988729638.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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 11012 bytes
SHA-256: 9498c2bf52d815eb9ec0a36d63138f8b854f01931abd7a44b3e5389776fac24d
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17480 bytes
SHA-256: f909b5f265dcbe14f6d8614938146a4335c54731e03fecb763bd8b0dc9e2c35a

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