Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4df36997dd6acbf…

MALICIOUS

PDF

105.8 KB Created: 2021-09-07 08:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d21f4e60861b31556ddfe9436cba3a6 SHA-1: bac8b1b44797155040753ee79ccbf2e91e1f7206 SHA-256: f4df36997dd6acbfa2ec6503fd9b50250e44db7d1ea74733dd42c10a8bd89dcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or redirecting users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to exploit users by directing them to compromised or disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=derecho+mercantil+rafael+pina+vara+pdf PDF link annotation
    • https://drosamahetta.com/userfiles/file/deburuditapezebale.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/gepof.pdfIn PDF document text
    • http://orem.mn/uploads/files/65855169516.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n18dlc8odo6qmd0vsmr4s6gt4d/kixomigozezipumidatuvino.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/84734211606.pdfIn PDF document text
    • http://signauction.net/userfiles/file/zekinofezosebolem.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/zozuxavufujidadawodivez.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/48312401004.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/wizisamikajozosir.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/sumitakikopuduzanoxida.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b1cd88165d4a6824273b8812dade0b02/lukumejogekigikamu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/jelunopofe.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/93831718817.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/d1mt43qivr8r6s10cn80963hi4/dujemosabexi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/96390282395.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea8ef321d---57640135757.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8c6cf1ded---26682208707.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124ca373b127---61000786413.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e39caa0d81---leturasewezav.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/dasax.pdfIn PDF document text
    • https://mollis.rs//files/dijasa.pdfIn PDF document text
    • http://imi.vc/upload/files/porasidojej.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_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC0 10784 bytes
SHA-256: af6ff2a2fd5886ccec862a2b3baf99ce5da55d4ccf97e13c2d80772155dec291
font_02_sfnt_off0001685d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685D 19452 bytes
SHA-256: 21eb47822e3849e61f46c4409269a66104ddb55114e6964cc914858a6fe07c32

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