Malicious PDF — malware analysis report

Static analysis result for SHA-256 c192cbd17c35de40…

MALICIOUS

PDF

75.1 KB Created: 2021-06-25 18:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc6ce6a0d27e2d1f5b19f6553907729e SHA-1: 15f799df336595e4e05ed3a29a1d9d8a28b158c3 SHA-256: c192cbd17c35de40b52bc1faf99ef681e20c9afab6fe2dd71a4c2d7bc81fe43e
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8510cae06e---lexixute.pdf
    • http://school19-zav.ru/userfiles/file/7658096472.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9grljcvj2vhtjb3j7b507f9ch8/gugewebanoxej.pdf
    • http://absolutelyneon.com/userfiles/file/mulujamepu.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/beziz.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608681c66831e---zegafope.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/fenipuxupix.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbd874aaf---tepizidumud.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160996ca691d7e---84436102727.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc849c3b5---86808902695.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa080c3b317---54392539626.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8550847e5---luxofuras.pdf
    • http://forter.vn/hinhanh/file/94945876605.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a9b52f616767cf4e32ff29bfadab8e75/gesaruj.pdf
    • http://perles-del-beya.com/userfiles/file/22311447144.pdf
    • http://hongdanhaudio.com/luutru/files/voxefufazofewalejexina.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bc703271---nobufagifote.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b850913a53a---87249546059.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeee412d6---temomazu.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/38819186b14e3848ab21876a0cd7f0c7/vegiziferapi.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/40540396247.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ias2tbpimnkm9eob9beteg1f5b/mozolufizusudoje.pdf
    • http://schmetterlingsgaerten.de/file/34517306818.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160843d9a68ca1---13434557264.pdf
    • http://lucann.com/Upload/file/49940866142.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/90717419115.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fts056j7rdvhrfdedeu01pq53l/40072667479.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a5a9dbedc1df735f7ed021bfa849a9ef/temaguzetilaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fine+tune+your+english+textbook+exercise+answers+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_off0000c2f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F0 16792 bytes
font_01_sfnt_off0000db07.bin
4656116ac2a5e13d4686237bb569e4d8c1d4da0e8c9b57ecefcedcb2a81d0958		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 11512 bytes
font_02_sfnt_off0000f5e8.bin
30e5c88adb84adf834006308a96b46c77eb0addc0ff8a0453507ecbf5e2b7f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 15808 bytes

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