Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d0faa261b1c4d9…

MALICIOUS

PDF

73.6 KB Created: 2021-07-07 01:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 880c3b58805afa06cefb8810468ac5b7 SHA-1: 2c6238c4fcb23ec9a625fff11b52e51537f80b85 SHA-256: e8d0faa261b1c4d98740d9e55877cbac94251536d05e1e4ae33809b986d5cfaa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF structure and link farm characteristics suggest an attempt to leverage SEO or disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sklepjola.pl/userfiles/file/7030784877.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7147e2deb---kimajo.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d39789201c9b9e786e146b0ce20fbed0/nenelotorokajagozurul.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nf9j157hmatipf5l85dgbtqf4q/78538108854.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/85ibliecoh4jbvfoeed6ipclt7/53673492021.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4682589c618fb6544c8c73740f058e09/55762301937.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b9e4a72bc---jitujupewivurukizenibisib.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8qbdac7214n3cl8vjepsfuae9j/99612949729.pdf
    • http://www.520amis.com/upload/files/59386776301.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/kewonuxa.pdf
    • http://atomleasing.ru/media/File/kaxixotaduzodunidojuwo.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27dfd7d24---74739289561.pdf
    • https://arhometutor.com/userfiles/file/nupabukexod.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b639acc9---dasovu.pdf
    • http://razaviota.ir/basefile/razaviotair/files/dosipavomijovuxazikiko.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f5f2222---83589327576.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c72abbd2fff---30691672395.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ai6m99mmcnk8bks1oaon46lbq9/dedeserigalepupub.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/96283965911.pdf
    • http://quatanggiabao.com/images/uploads/files/5154097698.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/05142dc23dce37d55b9b3e60eb134779/58089988275.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160921629a075e---60010621408.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a365502d775---10655786436.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f787a9952f---tosazarivatapusedo.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/350239606.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=marion+county+fl+gis
    • 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_off0000bc5f.bin
0ec3d9c46da2a274acd13430e1050d3afe55059e769af859cd0612ab54514d1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 17172 bytes
font_01_sfnt_off0000e8c0.bin
c6af07b891a01e7368dca0a67f11a738e7c66fc8ad717b73c916a4e881df9b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10588 bytes
font_02_sfnt_off0001011b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes

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