Malicious PDF — malware analysis report

Static analysis result for SHA-256 798b10fa682d7b8a…

MALICIOUS

PDF

90.3 KB Created: 2021-07-31 16:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d63e07647ce6448f768585035940c56 SHA-1: 61dfedc2a4418abc96b8302fe2d6d11191c287a1 SHA-256: 798b10fa682d7b8ae9951ff01cb33f19228abf2291062ffd7e1324118402ee63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0a59c1572495d973a41b4d39951e1fd3/23362091927.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b07370c4a52---6943911215.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/20303f57a550f549078073d27e941a73/fenakaximuwafodot.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/98584819903.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/suvavawefukabifukuti.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/807dde28f579f0c5be22ed1ef2bdc941/sosomukodo.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/fd7a0c8382c507d4fc22ad9b9a3dbdf3/lutesubobonizagifik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a351e9da---74896585572.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/54933707850.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/92512165564.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/vuwasisesufuzezefazet.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/143030120020515a9ea92aab0aec5ba5/1310106201.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078f68b81333---zesenomemekudosovisub.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c6d283f2c21e2c3f94f46d06b327a60b/98754169703.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9f2bc41cbbee6a582b405bc5faa26aa6/49944687867.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/jevejaxemunubapetigador.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720fc781c40---bezutokuboveta.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/lavizulo.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d2889f62159f603701b31c1401aeabca/pupotafadoteweserevomamex.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/wolimi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b33a110ff8---wilirarajegopez.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd27b6bc326---xilogedogarasedudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wwe+supercard+money+in+the+bank+glitchPDF 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_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 11484 bytes
SHA-256: fbbab15a547882e05ad432b3a55b26a999e24f1e1e150d12b9b2e7b9055684f7
font_01_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 17324 bytes
SHA-256: cf7a0c3b0f42d0a6a5f826c0363822881ecf0c13e5ddeae1541b972aa726cbed
font_02_sfnt_off000142a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1