Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01ca8d674eb8f2c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-29 09:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fef964901e8a6daf071b13df3debfc3 SHA-1: ebcfa9266877825a2f8e824d89d5235db081091d SHA-256: d01ca8d674eb8f2c5084071c249fa1d88cc0a8755c8d4422222f5c7b68e2f6f3
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 WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce3d7e628---53512944056.pdf
    • http://huntland.hu/upload/file/77370551179.pdf
    • http://andlupa.com/userfiles/file/91378634312.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95669d1022---xibetopepozadusot.pdf
    • http://tokstar.com/_UploadFile/Images/file/ziriwabakasogop.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/745c7df2dea50598c3de0d303410c549/93010648960.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/u8e7o86qqf23r38g69an7q78g4/vabuzudagazi.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/ripidiloxulazafufufemi.pdf
    • http://kingalbertltd.com/uploadedfiles/file/83423149986.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2607a67bd---85620333264.pdf
    • https://cengilli.com/icerik_images/file/tuledikawelomubes.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bccde6255c3---samajijajetezase.pdf
    • https://alixdemassy.fr/userfiles/file/88831622377.pdf
    • http://analogsys.com/uploaded/file/170962798760914d3a1389e.pdf
    • http://denis-lefebvre-services.com/fichiers/file/11865413640.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f0e5b18086d5ed9f5b4dbcd8794d7892/nitovevubetesikatanomuno.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a1e184733051c776f514d90b025cf8f6/26470996883.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/601281040.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b48e392adab992894340abc9c698a5e8/73595523745.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0d809a53---jukuvol.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc8e3f52d---lukevunopewixaz.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cfcd61710---72813008975.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+do+break+even+analysis+in+excel
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/594dd2f350d613df59537eef769c01a1/dawevow.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_off0000f221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16792 bytes
font_01_sfnt_off00010a38.bin
650f7468629b5198d74e226bf4cccacb21f1ebd6871b087e91da6514e1e958f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10956 bytes
font_02_sfnt_off000123c8.bin
e73da052d81f0772345abb5e77e1b37b089091d67207812236a05fec410faa93
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 17768 bytes