Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82499b98eed8059…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 07:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba3a93b6b38d4edb3873237000fdbc34 SHA-1: f4216d1da5d951be4f608268eb17151e59dc638c SHA-256: c82499b98eed8059e2043f66701e9ae46dcb7e78bfccac515715b2188b57558a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=best+spell+check+keyboard+android PDF link annotation
    • https://namhunglogistic.vn/site/files/gekekonezijugutozoliweli.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/kidobilus.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd728174fb8da632fbf7559c8467abb3/lakofutukobona.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/21627046629.pdfIn PDF document text
    • https://alpinashop.bg/files/9024699566.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fffa02cd1---93407981757.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/kitizaxabexuxi.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tebamadoveroloxusizuz.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/lokeliruvapanezobul.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/95668825656.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/jutowup.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/duxakevuxelemopidesigek.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ee143d4b---mosalogazuvoki.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/82358975632.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/bovusamiz.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/kodigurexerodo.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/jaxojizeponami.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/58394614649.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903042259337119.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/kepizejukupilepek.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/vewixofexamisarijesexebal.pdfIn PDF document text
    • http://wdnederland.nl/file/39651131057.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/80481763977.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_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 11008 bytes
SHA-256: a40cdb85acd6346b0c80230d549b2b5f3fedb279d6ab05285c29869ea539f5f2
font_01_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 17336 bytes
SHA-256: 0022c8a89a96a7678ee960a1a446c9bc875160786a04414b2408f44a736fa1c3

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