Malicious PDF — malware analysis report

Static analysis result for SHA-256 650190ab68ab766c…

MALICIOUS

PDF

79.7 KB Created: 2021-06-25 16:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26b85e4b4ba17271a9fdf1b2a7b1602f SHA-1: 4f6246adaf644b1d85bddf86b54446df9fd2c017 SHA-256: 650190ab68ab766c35f786bb083e8ac570eaa9f631433da1ee8a05d6df95f228
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772877bf56---lumelojuja.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j9no33e8fvbekmi7b66cusco45/filemetepixovovozexof.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/polunixakomaju.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/015f85f44696f58ed501d31b8041ebb4/66791609461.pdf
    • http://614move.com/clients/4890/File/rexanu.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4c7922ae---9531306619.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a046d16b1---mobipefuwixosogo.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/360ff8d41e1bff8402152c5b209a1822/59725865237.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430161132465631.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d47414a039---102608532.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d9f70503---pozagisonotupikoxok.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/j25pf33ou5jomaie8g9ftv47n3/56945737878.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/befama.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/4382556574.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8720e8c40e---58179809110.pdf
    • https://laurallo.com/ckfinder/userfiles/files/rafigagofibelosusus.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a2962572---87489644959.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fifty+shades+part+3+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_off0000d820.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 16792 bytes
font_01_sfnt_off0000f037.bin
71bbdf97311947d8cb784bf9a2abf9af8d7b2387321c3d9b0a8daa2f8c5d5c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 10588 bytes
font_02_sfnt_off00010884.bin
f40029ebdf08b59dc6c2e77807752c558cd43d8dcd7215889a0ac50e9e1154ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 16564 bytes

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