Malicious PDF — malware analysis report

Static analysis result for SHA-256 d892687c54c4edea…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 16:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b0819f4eaea65e04ee184bca2f5979d SHA-1: c33398d9de4b41c81cc4c29e70b67b91c640bc4a SHA-256: d892687c54c4edeab3008c1a8b8667d19890e03f838d2571fc0744bb9b9a0eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=cherry+physics+in+nuclear+medicine+pdf PDF link annotation
    • https://showdetango.com/bafa/userfiles/file/67379601610.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/9fdcb37c3bb96b803d22a3cfb593b5dc/motuxerubamamojog.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1629939661.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/28cefa9d11e811b4aab570fc95b34396/32729496855.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610108e7689b5---volin.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/77252983785.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/sudekotuvovibemikisus.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a07ac7b71---tusomibu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3deba0e09---80177350513.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h4vaq7r4qsoqe5kdijcvilsc50/9044329731.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/14367050070.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/91641358585.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/zotekefemuvanov.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/jazivajewetutinorumasokid.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/15234876460.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/92499580172.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/siwumivefodu.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/0spvd5pro0k3vjson0v5iulm45/juxekapojej.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/resobiva.pdfIn PDF document text
    • http://centronegozi.com/public/julusemoporekixosinexuzol.pdfIn PDF document text
    • http://0048.pl/48files/file/16068532623.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/kuzigomenefotevitonolev.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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 18352 bytes
SHA-256: a6a676666172d230cb2d78ef67db09a8736d548c053a770ee9fb42af099b192d
font_02_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 10912 bytes
SHA-256: c5ad1878a89a521b6991cba7413bf62d5b199cafd5526b1de354848be8795310

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