Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe31d355858327ca…

MALICIOUS

PDF

71.5 KB Created: 2021-09-07 23:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36e4af1575df1b8ac317560713ebd4e2 SHA-1: 5f860381ac3f69df798ba50c185cdf55578b1865 SHA-256: fe31d355858327ca0a57fc7c8fb910ae16525fb0642984a52bd9dfea096283dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document's structure suggests it's designed to act as a link farm, directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d306aadb3---41971672470.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/trbervu4hghls5to8mbttos9v7/90638582939.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/33435981226.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/4199996896.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b36f0f9cc3d76392b5e8380a66c8bcad/48745262888.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/vesanusiva.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/torolozelumevagesifum.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f7e5c3346---72740853281.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/6e22a58a689d69bd132c9aa3f9cedc0e/vegeb.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c1c242f5a---65881710364.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4c857be31---gavorit.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/38092706005.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/tokarirasag.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/91560139064.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608845306f4b6---xamiwobe.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/damixefulasoz.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bce556d750260300f2969ed1c12fde3f/90445517627.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160731ebb4f1fc---boketojoxok.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802ea741298---rolinepaditowojobivek.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f88479b189460bcfca3e98f989170b4d/9667368965.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gopawufa.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wefirorajipaniladal.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/20676067207.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/butupemunozazefapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cations+and+anions+chart+pdfPDF 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_off0000ba06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA06 10568 bytes
SHA-256: d4412dfe628d61f3c551b8d037c6e3a1ffdfb6f9d17e9d66534e2c28f5ec7062
font_01_sfnt_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 15200 bytes
SHA-256: c51f09811f3ba38bf5ca42e29b8c948ba5914c2aba705584b2c0b91c753404a8
font_02_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1