Malicious PDF — malware analysis report

Static analysis result for SHA-256 c650122b7af3c03e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 05:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c38ad7b4647da4d92cdcf7ba447783fe SHA-1: ef7a650e36c8fac83e1d19f97eabe7046a460ebe SHA-256: c650122b7af3c03e8aa8af0f40f2c190f2bdeb292d9c2100e8e91606df58875c
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised WordPress upload directories and other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipepopoxewewiralagoj.pdf In PDF document text
    • https://siltri.com/fck_upload/file/xadaradex.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rv0rs5q1re6dn23svsgj3eobd4/meluk.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/dizewapiwonevixobi.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/dulodasakeve.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/mekubuwumebijowuxutofamo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ffd53a4d6900676c5dcd8ab4ed33cd67/sefesavodezeleveg.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb991e8d6---tiveriwokoriditur.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/zetefatodi.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/43263996289.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/25245584945.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/mivaduborulafexujibik.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/14997427380.pdfIn PDF document text
    • http://93564497.com/userfiles/84785122627.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161429e1b8f48e---fevapibifogimiforuf.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/bf1752aa4c00d60ad0e5ba622b6eef63/72215142543.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/86402666331.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/ravajudidasebidozanelerow.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/87913877805.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/rejekubolavarakukijeb.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/fedidix.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/79d0160253fff4980732d606405df928/10682159289.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/sudubofoda.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jifiri.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/90268902714.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091605421735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=decrease+image+size+androidPDF 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_off0000bd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 10628 bytes
SHA-256: 435671fae8c72ce7e3d147096026e82007f45c7607b314a66e3de99e886cc454
font_02_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 15948 bytes
SHA-256: 3d67741119af6164fb42f510b71ae1f9df4795c8c2c8be2de86cb43d13fd1834