Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e161f4e53d9c08b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 10:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb1498fa2ed4e316e005382d354d27fb SHA-1: 56ca58f86dc3e8ea43343b4ef713befe36e58f1d SHA-256: 3e161f4e53d9c08bfaba83bbbfa21089ea8a8453b599565bf55e1617efb0238e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure for downloading content. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ClamAV detection, strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://frutapac.com/ckfinder/userfiles/files/16430903085.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/sojezefekepa.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/52407480007.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/88f3322ee278c28f79f5e811fc4a109a/19510430785.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/66277154724.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/dawegozebifarezenuxubejo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kimafepuxaloxejiperol.pdfIn PDF document text
    • https://tl-systems.hu/files/files/33707552678.pdfIn PDF document text
    • http://saimiri.name/upload/file/46477080930.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/katuvivot.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/degalawotenojite.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5c424ff14bbe5ec7f5b76acd74f9d4f4/58465821003.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/80714457429.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/6952474684.pdfIn PDF document text
    • https://capecoralliving.com/media/file/11301042728.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/92418845034.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iv2qcno33rome6p5c6gm10q726/ropakewegimubekijuko.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137066e24e99---bupenazulomalilemipomugu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/vetegujepigabeg.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/jemegipegezuxibaw.pdfIn PDF document text
    • https://ambalatender.com/upload/files/33210652463.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/97704097252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=open+aspx+file+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48C 18104 bytes
SHA-256: 0976065feba81cb6f8369ca9a3a672c4ae637d992fc73c6ece3b95d25feaa927
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 10520 bytes
SHA-256: cea826bca60ea25aed19b5de928d4e017799c704329473fa8ebbb56662ccfff1
font_02_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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