Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0744e245c332e1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 05:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba7dc9de957b7d3305fc784975ea3980 SHA-1: 6c16b5ea534d4d3a06da4de54043384b71cf2930 SHA-256: fc0744e245c332e1e69d8eb6f2331f8deb731d558d94c323da3c9aabe4dcd6e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which are part of a link farm designed to obscure the true destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=different+types+of+spectroscopy+pdf PDF link annotation
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/30356445060.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/roxomixufeguxagezi.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/9712608589.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/zimufige.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4mudcbvepgit4aoid7j2j5oeo0/49780414293.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/30279436541.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/a7038aef87cb3abd9e453dc78d5d9aac/1107768697.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/tobixododujimetapesola.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/87de333c3b634ffd2d72bcfba39d5fec/88478739159.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/rimulolan.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a790cd71084---29152412392.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/nukazepapokufewotaluw.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a76301851b7---23971238441.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161268ec8e22ec---86253498501.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/92004607709.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/43375660387.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/bawetuwivigidazide.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tipelel.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a9520560fbcc84d888e3bbc9f3808938/69038216240.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/77302422426.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/wurabinolupumola.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076c86cb5aaa---17059852782.pdfIn PDF document text
    • http://iviltra.lt/images/files/44171182208.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/93829914138.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_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 10520 bytes
SHA-256: 2a7af8bcfe9f1da7c9b1ed70d9697c38adde4ed22737209ccc36004cb96231a4
font_02_sfnt_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 16492 bytes
SHA-256: 479261d323481bea6b8ff93b9e32f378e78801e875a4f5e180592570c232dca2

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