Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc38ef639429f38d…

MALICIOUS

PDF

80.4 KB Created: 2021-06-30 21:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa41562fdb0bd94eae21679bc740b5fa SHA-1: 449c7353827fe99c3d48759f81e0c4af10d872f0 SHA-256: dc38ef639429f38de76b2be013b76ec1e6752a83a532b0c5b8cb67a67ac260cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=what+is+the+molecular+formula+for
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609201de3171f---64540022990.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf64c9cd28---kebixadatefo.pdf
    • http://salkim.com/userfiles/file/45688982612.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210615171759.pdf
    • http://sosnovgeo.ru/userfiles/file/1180114928.pdf
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/vozajisojovugad.pdf
    • http://jucal.es/images/file/zelasetefako.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/dalijaduzubexes.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a158672e8f1c6c137b596770a1fba04/ramajoxujeja.pdf
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/75095395693.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1c181c742b26d11694d29255c60c57b6/27918202481.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af3da9d3b7---67563874989.pdf
    • http://ccswcd.com/userfiles/file/74493557730.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/37c8a6cde46bec2afdea811e4c62f58c/5670092066.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c03ce3ef6ee2002a01f58a38d3882936/riguzukob.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a366cc3c53a---dikalamavavudekafop.pdf
    • http://udmvdpo.ru/images/files/8366072807.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b04a5fcbdb0f2f6e2246ee2e567cc72d/21912549659.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/919gougmb2pna2ni6vcn63f434/78162522745.pdf
    • http://hondasushi.com/uploads/files/6927255727.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a62e15e42e9---19767911526.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8k2e01fqpfb2ov6rlrg6nof32o/mozusorijoxumuwawetuveba.pdf
    • http://kompletucetnictvi.cz/files/file/luziregada.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4f2d873f3bab31e8c33b519971886634/61877195288.pdf
    • http://marmaraisg.com/images_upload/files/wedit.pdf
    • http://agnieszkapawlik.com/userfiles/file/gumowemulovira.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_off0000d80e.bin
5eaa27bcca43ccbb1ead3aa2c45f5be5457828f3f6e87fcb39761ca515116236
pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16768 bytes
font_01_sfnt_off000103db.bin
4fbb06fe4af889fa42fa4a4f6f8f9e10787d8ae3e3b8a529dbbd626405fd008b
pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 10592 bytes
font_02_sfnt_off00011c18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 16792 bytes