Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73e6fbeb3af9a42…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 21:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d44c570ea819cfb5821371b09323543 SHA-1: 89cbb25a5014dbefa303c7d9c5e0f12ab597576d SHA-256: f73e6fbeb3af9a42de3c2551b286edd812c85b9e71224c6839a0fd935ac98a65
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple domains, with one URL hosted on a compromised WordPress site. The presence of numerous links on potentially disposable hosting suggests an attempt to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138493c9d3b9---21107712139.pdf In PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210924211729.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/firiwowajugenos.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/zenomuwesexurinumajute.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/23038532489.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/leguserufadefipuj.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/vametufazipiwanadevibiti.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/zobirifemud.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/rudiwolukufiguzezari.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/85875470800.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/483fe0fa87fb9f39e8bdd9d00d702fa1/37028130281.pdfIn PDF document text
    • http://mfcpavpos.ru/file/sarutukovej.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/numubugabivokebovide.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/14347397484.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130abd928db8---84894154529.pdfIn PDF document text
    • https://vzglavniki.net/data/file/36129826710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+mod+apk+for+androidPDF 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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 18912 bytes
SHA-256: 66232a715576197de2788a91254db6a10fd64092dc7b7ecc9079975603519962
font_01_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10444 bytes
SHA-256: d90fed781619bf3425ed305627fed44eea697bba9fc9e20cb9574c8b3c122f59

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