Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e60b51045be187…

MALICIOUS

PDF

68.4 KB Created: 2021-06-07 00:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb67fd9e3f6b96876b90be9a1435da64 SHA-1: c0f109c800b3317f088428ff3758d68466fb1ff9 SHA-256: 23e60b51045be18754f10f5260f5de8f6e4f33ca405cfd457e64c061b2704ca0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable domains. The document body contains metadata related to its creation by wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=charles+bukowski+la+senda+del+perdedor+frases
    • http://strandedtattoo.net/file/podofopizikawo.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/6df80ccb6b7cad52e8d49e1a34a035a2/dosaxivezuxu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc47f56e66---99507017177.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075805d99071---wudenizukeximukowerak.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b02c1a73ce---xibuvimufebubed.pdf
    • http://doo-san.com/userfiles/file/20210510043607.pdf
    • http://szkolka-wiercioch.pl/files/file/levevinulupefabotozex.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/rk3t303md170gtvnallp1msl0k/nojojupijakobiwuj.pdf
    • http://okfilm.kr/userData/board/file/wuruzaral.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c629c485---25370602911.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d2921f78---rojewubigebizetotamojog.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816be9aa498---64666476477.pdf
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/44148066188.pdf
    • http://automotiveenergy.cz/userfiles/file/dozegotejefupux.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a703564b1f2---42044066972.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3ff02108dd1e844f146a413a055f3b15/47302740607.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d060.bin
5e4673732af8c8eb2126601d5bad669f6faef9cb90b712712fee4da94d561e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 5332 bytes
font_01_sfnt_off0000e281.bin
fab22a2048047579c23d07930975e7de659c53ee19ba700d8be57d4fa7f5120b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 11552 bytes

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