Malicious PDF — malware analysis report

Static analysis result for SHA-256 90530c145248de43…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 05:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de62f0832e774adf3b37e9ad41bc11cd SHA-1: 86c0addd1fcbb0ba6c215f35bc1afc96e3899f95 SHA-256: 90530c145248de43d9f9f26a2d479387ade977665569ddc77b4195fed09daed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408ec8c4273---97761933826.pdf
    • https://fsbulletsandbrass.com/userfiles/files/84018859352.pdf
    • https://laptopserwis.com/app/webroot/media/files/lebabetapeziwo.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/wamiluvafew.pdf
    • https://deesudcoolingtower.com/userfiles/file/jefubagegodukobaj.pdf
    • https://www.campacinter.com/image/upload/File/26397848319.pdf
    • http://studiolorenzino.eu/userfiles/files/86393481168.pdf
    • https://thefertilizergranulator.com/d/files/gegemagobabewezunatevufe.pdf
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/runadebibujatofikix.pdf
    • http://sovaimm.it/userfiles/files/88411392596.pdf
    • http://hanabi-la.com/uploads/files/56263687971.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b73efb0401---37199393448.pdf
    • https://ikuseikyokai.jp/ckmedia/files/33198426611.pdf
    • http://dagmare.de/userfiles/file/mularuweki.pdf
    • http://w-mill.jp/images/file/54111664161.pdf
    • http://runhouchem.com/upload/files/21732007878.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7db6rook8pcfp42onpkeslsbo9/basexisujaxaxikewazus.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613376331c2aa---tunirejulagaje.pdf
    • http://birdwatching.sk/media/file/22684292586.pdf
    • http://7seapharmtech.com/Uploadfiles/files/68289669354.pdf
    • http://vedepcuaem.com/luutru/files/44185253406.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614103fda7016---9306236573.pdf
    • http://kiddeefire.com/media/userfiles/files/fejeminamavujosakagip.pdf
    • http://cgemfoco.com.br/ckfinder/userfiles/files/sefolinu.pdf
    • https://homestayhoian.thamtuddt.com/uploads/image/files/88224557981.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+5+android+highly+compressed+zip
    • 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_off0000b193.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 16792 bytes
font_01_sfnt_off0000c9a5.bin
752841b7cb195042fe9cac1bce18dffd779aef8800aedade71035ff02185b156
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 16048 bytes
font_02_sfnt_off0000f27c.bin
81be34d2b290ed835346539724d07b308a4e3a830882699ae55426e2f46fbfed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 11308 bytes