Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8afb91a6e884a26…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 21:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ce2ceb1f84ba9ea041c7ac844cc9af1f SHA-1: 7900007efebdfad73fdaea2e6ffff84572b59e01 SHA-256: c8afb91a6e884a268943939191d13cf41ef328462b309142fb0d9f2906851aa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/afb9944fc5c211c8684f6b7c13eb2fa0/bivuzokupevudugodow.pdf In PDF document text
    • http://videofilm-tv.ru/content/File/72413097852.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be198eacc16---88086885727.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4690cf0f31cce7d245322ad6295bb2ba/57211299717.pdfIn PDF document text
    • http://charivne.info/images/file/51440968280.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160764d5d019e1---zavuxabasesakavuf.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/17175886284.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3654b0bd8f---rubesezekaxefubiki.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/busuvasufez.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0f998c678---zefajijipedidukep.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160950c1c36f4e---jofezagokolapinavobez.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/20559824948.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d2ba64c6---ramezefaxuxekigunadeji.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/laxatisakofepazixo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c6f869b2---najilular.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/52088132498.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/84042310268.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bofasekopafoka.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/757387350.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9075c7ed253a8f3d6cb22d407bc103c4/vozedosijovexewisogorena.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/4ff4e2499f0bc2c09b163b7bbc2b8586/79049539066.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/issgig61h88htc680qgn6ooe8l/zebofotasepuzelamarip.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/58684487345.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e0ba090c---vunanilesekitakemakol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+very+old+man+with+enormous+wings+analysisPDF 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_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 11044 bytes
SHA-256: 7204bb0fd6d749d71a8ccf7db34e8c7bee79689aa0e69a7b09fc2f63f75bc3b1
font_01_sfnt_off00011654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 18144 bytes
SHA-256: f50d1c40ec07f7342e444fa3e4054d2a8ea7382916a97050710e1395017ba4d0
font_02_sfnt_off00014491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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