Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9f32f8b37ddc0a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 21:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03d36d639a417bd2b62f8e1fd15ae77a SHA-1: cd64d85baeac5885dfc1b664dd10b28df4e51575 SHA-256: 9b9f32f8b37ddc0aee73f0ed241448c73ebce297ab0258b3ca683028de24914f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eedf5b20b3.pdf
    • http://cuacuonanbinh.com/userfiles/file/34434329677.pdf
    • http://solarexperte.ch/fckeditor/editor/images/file/73545628072.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133255dbffe8---nigazu.pdf
    • http://www.parinet.fi/tiedostot/files/6630417151.pdf
    • http://walosports.cl/userfiles/file/madefunuliwumuzevuwuwu.pdf
    • http://growlink.biz/userfiles/file/72428426598.pdf
    • http://likuidart.com/files/ckeditor/files/22654228004.pdf
    • http://cy2hand.com/userfiles/83815233702.pdf
    • http://solo-reisen.com/media/images/file/bukozutatemikemaxu.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/nidakan.pdf
    • https://marcvandewiele.com/userfiles/file/35606911644.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/bajumuzorugade.pdf
    • http://rinsacars.com/files/others/581740545.pdf
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/butamowo.pdf
    • https://swiz.eu/files/editor/jigibuzixirukebuzuxevajot.pdf
    • https://komunalno-vrgorac.hr/files/58237149589.pdf
    • http://shrlie.com/upload_fck/file/2021-9-15/20210915140122626152.pdf
    • http://genarchi.com/data/temp/file/gifonerulazisujep.pdf
    • https://genegurumiraclehealer.com/userfiles/file/78449568356.pdf
    • https://grandplaza.bg/uploads/assets/file/41718287605.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e2270c8d---93603961305.pdf
    • http://elmbbq.com/uploads/files/vuzaxosodakevowelupuve.pdf
    • http://bienchidan.org/uploads/files/12239305425.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=stillness+speaks+free+ebook+download
    • 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_off0000d05a.bin
11c595bc9724a47f73fb5738bb6d0e7de26b73333b760fc550c4dce2aefe3710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 10884 bytes
font_01_sfnt_off0000e966.bin
fbd92143c675e04072c47d2d5b9c3f0200fa1008d6b16d28e2407b8bcf89aff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 17096 bytes
font_02_sfnt_off00011521.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16792 bytes

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