Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20c715afed91b28…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 19:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35836a8a1cf0116367a1fda985519967 SHA-1: df53a0afeb6fad3d660a00f346114c2e8d59026c SHA-256: c20c715afed91b28e0fefd43e6a8cdb8773131a5544fb215edd9c6ea2c92b051
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, likely intended to trick the user into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://fouladsazanco.com/Upload/file/2432574558.pdf In PDF document text
    • https://svetplus.com/userfiles/files/waraloreweg.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d8ccc42c1---raxopisonot.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5232c21ac---retexepunavovijidu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b2d4211e0cad335271ffc1fc86d841a1/16018032861.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc778a9184---jujemulabaruxezafinizaf.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8349e48c---kusetetimujofagav.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f602d8c203---vosasojexox.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/59245952485.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/69711555719.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/sebanamosorujafadejane.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/23367095271.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/vekejum.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/bewipazodobe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b2fe0cb3b---60287920848.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3fe1aa17---80924269838.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ca40cdc6---24789269607.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b17408a7---wijerusapurajamebexaxamiw.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e99e690bcf2071cf9da6db4f0aae874c/13115915972.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9e567ab---ronutupexino.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071786375085---14570689394.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/018766e4ed895f68447a8aacb54adfac/laxawekepadasexenumox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+difference+between+exempt+and+non+exemptPDF link annotation
    • https://mediaget.com/userfiles/files/6640442262.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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 10960 bytes
SHA-256: 886d527cdd280be7588af712227a5d5de35bc5af8d3d8d51b9dbee4eb17e33be
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 16816 bytes
SHA-256: d6899da4f203df8dba44fd2308220999a3a67a478f68b9fb5267a584e334b339
font_02_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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