Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc714ff8fdc252f0…

MALICIOUS

PDF

93.3 KB Created: 2021-09-23 19:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99db3f49c2550251013ba64dadaf3613 SHA-1: 8fd1ef6c6662a8c0223045ed0407c5fc8ea1198e SHA-256: fc714ff8fdc252f050c9e99b76d72eace14d104cea46ad8d79959f7ef152cd12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://swaminarayangm.org/userfiles/file/57988053381.pdf In PDF document text
    • http://www.flamanville-76.fr/upload/file/ridavababilafukel.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/vibejovi.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/41768228993.pdfIn PDF document text
    • https://apelhijau.com/contents/files/90877759393.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepoxizam.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/90520983198.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/kisawasunefixewogi.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/41199829021.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/razugobusemavejowofosepew.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5648a22---15055922539.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/61198956513.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/poreviramasotusiwuj.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/tabofowakumobegaxof.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/xetexigomasotivesobebojad.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zodatigob.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16144d0a6ce6fa---94654620776.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/nizuxetavofufe.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/laxuja.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/pabawon.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/puforidex.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dezarojunixaruwewetona.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/futuzonifoka.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/xidugivoletibutipok.pdfIn PDF document text
    • https://pedrazzini-legal.ch/UserFiles/File/29884416417.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cbe1158e5de4a76557e6930e80f3d2dd/54499536425.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///vavebelotulagusamofow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=definition+of+osiPDF 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_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 9900 bytes
SHA-256: 490d8e92b096ef64079c224b2fac4d48cc914d7dc968ff8d0075a5b351280898
font_01_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 19460 bytes
SHA-256: 4f12f48ae1de093c73b1089a3ae74db0993fa70fc05f08565eb87e16774c366f
font_02_sfnt_off00014f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1