Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af3917505d2759d…

MALICIOUS

PDF

109.9 KB Created: 2021-08-09 02:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e20c67fb0ad108b6fbddde4297aa9b99 SHA-1: dfc5d2a0d1e9242223026336129c3d20640a4d57 SHA-256: 7af3917505d2759d11250f258617c786b586689f977516c56c8620bc08d3e197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to phishing or malware-hosting sites, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9330

Heuristics 6

  • 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.
  • 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://aspirans.com/files/file/gutulugurofidit.pdf In PDF document text
    • https://jamisonfurnace.ca/userfiles/files/xixuzeb.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ccd9c060---66874645707.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/qv56btd8t1sndorvl8v1ndnq0d/65506710788.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e657c09b0---1443938224.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b0519b5c9fb---vazanu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/93180834444.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/desukiwexitu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/virezisafemonifik.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/57166318026.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3398cab6b5---1147301047.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3dac4385---diwegixelosisikobajowetit.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/rezudopupejefusubosi.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/26155009451.pdfIn PDF document text
    • https://ka-base.no/images_content/file/bavagajamijipojakojanab.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b48ae4b20---41137823331.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/zunupukuxijuxaj.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/38825092810.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/32069768401.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/601e53bd3a4d2c285378f7485e72c4ab/zumetunu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f431dc2abf0ad1718199fbc275896c00/12916762787.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cefce97be49---66632574807.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gr2p9cvgb5c6ul0grmkp3sqvp0/63977534858.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0c11886a4---netozisepozosowejabiwilo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fne9duas5el1u415kvg1u18a6b/50847584124.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6957314e6---bakebipobozoxufekuvapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+fix+jandy+pool+heaterPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001398a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 20848 bytes
SHA-256: 50eb8e8c9d64789b5f05ac33521454ebbd8be2ed424b6970901045a1ed7fa4d7
font_02_sfnt_off0001716e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1716E 10848 bytes
SHA-256: 119d9441a63be1c5a79ac53e022ede9444352aa9a2274588e66016d0de07a0e1
font_03_sfnt_off00018a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A57 1772 bytes
SHA-256: 7e763defba2cb0c2b33938a071b4d159e5677c58bfa8872641819df43ae7a0fa
font_04_sfnt_off000192af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192AF 16376 bytes
SHA-256: dbb3a06a484f839c646290cbac717987685c4761264ab4943449d493ee5aa217

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