Malicious PDF — malware analysis report

Static analysis result for SHA-256 51051b26a5539b0a…

MALICIOUS

PDF

203.4 KB Created: 2021-07-05 19:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f9b17671a61920c58edc927ae063f403 SHA-1: 3369f6304efa858f5dffd0577fe06ecaa4853160 SHA-256: 51051b26a5539b0a888ea27fe0e49a9ecb513502244bbea137f7cd5f37a0bf90
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS uploads and SEO redirectors, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate the document is designed to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=honeywell+engineering+manual+of+automatic+control+for+commercial+buildings+pdf PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e6bd5fdd---lifutipevunomumokotinij.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/65309185926.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c281f7c4f8c---zexapuxosiwaxegotuxa.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/nedelogaxegawokukibi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3thijuhni8eams8h5r27pb19g3/15126954808.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a29cd9fa12---sesuwokavad.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e8cc864d2fa0e1f26666a71e7bf03f5c/12852121370.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/novezanolopikumese.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4d8f3562---45086774858.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/o76u4e5e7j1tkif2klco2hp6vo/2715775840.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4af111da4b---49571271186.pdfIn PDF document text
    • http://klpa.net/userData/board/file/20469465641.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/tukutafuz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf4f57030---doxatudabupojevefojikuka.pdfIn PDF document text
    • http://rld-carbon.ru/file/71067169991.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/98hu833inhcadjta1j9horo7g1/pabefurebimomuwijakugo.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/ralevaterokobowev.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cb8a0534---27191359986.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tikujuf.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0af6600ac---19836557718.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d93abfae4a8---vanoresenozewumepododa.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/611908d1957a0446936dce4e615b2fd8/8326988000.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/857173945.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05051b365---sinugexan.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_off0002b672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B672 11396 bytes
SHA-256: bf1ed63838dc5c1e5a896e4379ee1003daed2dd18947d62977cf7c068fc164b7
font_01_sfnt_off0002d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D0EF 19392 bytes
SHA-256: 91a3ccb63ee956901ee654adbf924844b38570333fc7de1cc0d6a215cb2f3fa5
font_02_sfnt_off0003043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3043E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1