Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3c0547e27cfc0d…

MALICIOUS

PDF

89.2 KB Created: 2021-08-09 09:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ec5b850116421cd0698f5bf458b1840 SHA-1: d7b48917a107f6bc236c0d4abd42c2ebca1d277f SHA-256: fb3c0547e27cfc0d5f3c03f2a2216ee509379b635bcd27e070eeca129828f8b0
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://centrons.com/uploaded/file/13627710006110629b0504b.pdf In PDF document text
    • http://andlupa.com/userfiles/file/rovizamituwititu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50f143030---74533641293.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5065069ba---rorumigiveli.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/19388540374.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/3ou46a0m1bmh0nk0pq7calgpo2/83256098217.pdfIn PDF document text
    • https://ancoraeducacion.com/images/33828069935.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/681f16f813258dea1edfeadf9135aae2/ketusefokif.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/kosedam.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/1101382581.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5kgakvajqkhark0vcuguvhgrln/73041028912.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/texudizoturege.pdfIn PDF document text
    • https://rivnerun.club/images/files/wegixilejuri.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/sewumeme.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608777c0a5d2c---wijujezatisala.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4b36cf0eacdc503450b45f33a712973/rebaninuzemokar.pdfIn PDF document text
    • http://hangquangauto.com/files/kolidus.pdfIn PDF document text
    • http://geose.ru/userfiles/file/gosigulusewajimufugani.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/luzobamugejomipedefiran.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/galuwororaxigubaripogig.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/jokikotipejuwakotiz.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/vivawo.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ojef34veekeapvt906m8lp65lc/faxodotado.pdfIn PDF document text
    • https://0900107678.com/upload/file/rositobowosin.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108071555197074.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/eba68b52003dcd4badadc2256d503a1c/zigivobesofiwuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cisco+air-lap1142n-n-k9+configuration+guidePDF 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_off0000f5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 17172 bytes
SHA-256: fed9ea847ca1de60fdb0f30d34b8ac64065a3429b4c3c38f51a9f1d27f6ab248
font_02_sfnt_off00013ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE1 11472 bytes
SHA-256: 038b742234dfd71e775a36b97fa0a2b233fb9d0694a0bd92885aa81daf06730f

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