Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dcb809cbf25382…

MALICIOUS

PDF

83.3 KB Created: 2021-07-15 10:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a37bdbc2505872f730ae81314606c2e SHA-1: 2d176be968798792f7c867e7e0bb975c74e988f8 SHA-256: 68dcb809cbf253827d93f111f2db3e763ca95a29dfe95e1d05ecbe29dd1280b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead users away from the document, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=picture+to+word+converter+online+free
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58e3ed353---1507813903.pdf
    • http://dlt-nkp.com/fileupload//file/vimusujovem.pdf
    • http://sbnjl.com/userfiles/files/28634298544.pdf
    • http://alexdisinfestazioni.com/userfiles/files/55426803584.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebe8eb99a---88050783844.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/8f75ed702bf565e07e4a7f5e856b0bb7/kasedetaxedorumisogu.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467f13383d---56333378067.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e84312c18f---vorezabamilure.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/26056435735.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/guwigofome.pdf
    • http://agcslohian.com/userfiles/file/bijonivu.pdf
    • http://bawwabatrizq.com/userfiles/file/nezulumamipob.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3258d68a955548a276ed51e588ae9d3f/9848942672.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d908a0b578---dilajisikaga.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb40719238---regubobegikoki.pdf
    • http://accessiblevehicleservices.com/userfiles/file/18160310056.pdf
    • http://branpc.in/ckfinder/userfiles/files/risuwukazilarowewir.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e69789b---76383760242.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160addeb4199ab---20050666846.pdf
    • http://autohondl.cz/userfiles/file/fetol.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/10918c7af5360fba6af1df6d4cd2f441/zalerapomesefekalevelavog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d8.bin
8af82eb7604ed4a9c6071f4946cb513312a62247e8bdb6fb89804017dcaa5611
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 10392 bytes
font_01_sfnt_off0000fa88.bin
7abaeaf0faf9102fd9e1d9e584bc7f2df78393651c103849403a58b298f88891
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA88 17316 bytes
font_02_sfnt_off000127d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 16792 bytes