Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde38d789e348e36…

MALICIOUS

PDF

91.6 KB Created: 2021-08-12 19:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18d5b959430c5ce707be421deb329c6b SHA-1: d0d56b6caffc18fcc62780cee8be6e82498944e8 SHA-256: dde38d789e348e3690a21286927d47febf0ba81c215b5639f5248c619fccba4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, directing users to compromised WordPress sites and disposable hosting. The presence of external URIs and embedded URLs suggests the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=traductor+de+ingles+al+espa%C3%B1ol+con+foto PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a33d48e10c2---feretotabafabotaniv.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16109149434adc---69895337986.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608318352e4a5---fodazutoxadomoxotat.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58c505eb0---7123219668.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1a818030a72fa86cb0a5a160e1edc331/90982475173.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/gimidutuzevawolewebaj.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ca2806268f63cc5f0a976494488ee651/jekop.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b951d7c38---gomelunajipupapejesa.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/72826124183.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ac9c7457---23484841988.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/xixanuxufim.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/nuravakelirojis.pdfIn PDF document text
    • https://people11people.com/uploads/File/74440564666.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/piwedenejisufenumosaw.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/mesaxudaxivo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/757a27730fb9151db9e93a8e06cf2540/fipurikoxurex.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5js54q7tu2l1ij7vldnjdr79sp/labog.pdfIn PDF document text
    • http://ledson.ru/upload_picture/90681141348.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/03a0da1163edb3ea417ce77e9eaed424/40110476378.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/8281829728.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/9173798462.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/retezuzefelunemibu.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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 11064 bytes
SHA-256: 74ad2c9c1fa94ed8f1bfdd48754b5f82421aa9063e18997fac6b8db730f54362
font_01_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 19384 bytes
SHA-256: 5a9ae9173d74c23dd161f81b26717798b070ce82c07342cb62bcf49047bfdc9c