Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ea567b5f24cd49…

MALICIOUS

PDF

87.6 KB Created: 2021-07-31 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07473519085423c45201bd15ee527e28 SHA-1: d51a9ef51e1fc37dd65eb5753a357864aff62a02 SHA-256: 39ea567b5f24cd49de867e1135611b03e4181f7b0d9b92721cd1e88cf0c95e0f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://starrwindow.com/clients/863399/File/63198570878.pdf In PDF document text
    • https://avayemehr-carpet.ir/data/file/menokopolizeguz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7qn0bt2li7nerlmdkpcski8af4/86087211310.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/negotibigixerusi.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/93934345721.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/4744480487.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3f506a78---tolawufim.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/59419328986.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/zagodetewajol.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/xitunamixesomol.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/febinemisitezomalutudebuk.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/81781334065.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608941b36713a---seporav.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4a01ab49be699721853725f5792f805c/geloboridemox.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/xexewega.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/41142548136.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lurarifib.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3dd823e6---lilokudid.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e30596c5---52858130389.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8ef9208f63e3b744c1adfe2b7d821291/38306463357.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/koferozimodawon.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4d0f8a6583f13eed3efd0468561031d3/37223588326.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ikdlebiefqsmi6ag1ucn146lbt/20061729040.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/16687198114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=u%C3%A7un+ku%C5%9Flar+medineye+indir+mp3+youtubePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 11448 bytes
SHA-256: 377f931dfbe339d806b2d2e6dd58f6b7bd5d61e5b6f3dc5cbf6a19a11790c478
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 18440 bytes
SHA-256: 9b8614d039eaeca0400cd224b911d59b55bed7126d309e7162551e1d65e6f4c7
font_03_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 19692 bytes
SHA-256: 2f178381766a40f73455773e569d5b33e36677c42eeb1f87db103cd7bc57e0cc

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