Malicious PDF — malware analysis report

Static analysis result for SHA-256 f036e70f342ff63f…

MALICIOUS

PDF

77.5 KB Created: 2021-08-10 13:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7af125d6e304e143c122b6db5783a6a3 SHA-1: 8e949e764ee4c2b410a4e43f0d919a7f606020bd SHA-256: f036e70f342ff63feeba5d50d48f7b43572d8c86cb71711e5c8ef70ffb88abd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://medvor.ru/uplcv?utm_term=soluciones+matem%C3%A1ticas+aplicadas+4+eso+anaya PDF link annotation
    • http://mobilni-kadernictvi.cz/files/file/34301579903.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/699fd2205cd39e10835dd484e54e90da/86577307494.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a403aa036---57158448825.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81a269f0b---xodepukajenejajabinibotu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/73881948614.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/17681241405.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xijesipijosawefijufo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/xoxitonuzo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/64cdcf7fb80deb017e49b74dd59a3c25/20769492432.pdfIn PDF document text
    • http://186086.com/upload/files/jidoxifegopu.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/10067613075.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/30546153973.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/kodaxutataperojitewuluj.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210706_081645.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/gevobefonafamiruvofupugi.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6755b132---feteruxejezabiw.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/xofuvosiladokamagu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/7453710448.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0bade8802a71abd00ef688416fa9a58c/witesobesi.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/poronifisugetuvem.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d99e7693fb2fca613d4eab05139ffa9c/bapixuguzedurozubiwenapi.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/76735756020.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/62339049270.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_off0000c7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 11120 bytes
SHA-256: c84f91a53289b383b98678f58d39a64f65bc130329b2cb470d521eb3a5eb8bb5
font_02_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 17268 bytes
SHA-256: 6869c842cc81e638a81b1b52313d90f6072d784dd89ec15e01c145392d89d9b3

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