Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd954832174c3c6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-31 11:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e98a9f96bb7e68370026c76a5e8b5d6 SHA-1: 63219296394affe0c9c4d1a78d4840af32013ecf SHA-256: 3bd954832174c3c68499e2a2615f80d0b3d0182f4aa3918ef474caf34575e9e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The PDF also exhibits characteristics of a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These elements strongly suggest the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dkmmotor.com/files/userfiles/file/24343912721.pdf In PDF document text
    • https://ideylia.fr/uploads/file/bokivadu.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/wepiselajotewugiveteruwak.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/5f2c10752ae55c8b26b9900252c1754d/matuvitegof.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/68187532170.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a2b0103f8---kufogebipabidoxixino.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/55518912415.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160947bfceea5c---valoxegarakorotadew.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/vowurunafogim.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b66fa74b7---76400321386.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c431e8745b---26141244171.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/zakekuluxomavapaputugi.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/godisid.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f9cd0aa71ca5ed39fcd1fad1dd57ca5b/94945059728.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1b5bdbc5---43145551775.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/kefonobu.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210527163357.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5htluquji7c8hjm93psi3i6kbt/gibilulimixi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31c465394f---pakatalexofozakab.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/47094106974.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/nojupuzunafatom.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tutafexuvap.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeafcd96833---15101726986.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7917d0ccb3e6a2e7fbd7ebedac451be7/bivoxugibomiradudaxogujiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=audio+visualizer+after+effectsPDF 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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 17228 bytes
SHA-256: a7e313ea9b7e4dbf7b88b2ef3e9816efff4345f12c79b22713c53f2baabae1f7
font_01_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 10572 bytes
SHA-256: 6ad16d31cfd2de70faeb510f339c65d493de04595e28fb1ed7d1d2a885a294f2
font_02_sfnt_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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