Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fee0264298db910…

MALICIOUS

PDF

90.1 KB Created: 2021-09-07 00:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7961f3acd7f751e27872634a18601c8 SHA-1: cbcd6047375d31b0ab024d207aeb309f0232f5ac SHA-256: 5fee0264298db910b649a970243067ae42e44b13b69dad54366b5ee40f0fc06e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ttccid.com/userfiles/file/xutozarawejovopumuzapo.pdf In PDF document text
    • https://verticala.ro/images/userfiles/24979132966.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/kewaberuvaketaga.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/28536047644.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0644d00f0d6cea3bfda1696ca3bb17e5/wenodobupumepudisit.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/kokebed.pdfIn PDF document text
    • http://polletnv.be/uploads/files/5051382049.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/gozaxarazepiw.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/52483572005.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/selozanonaponobe.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/durilolewuluxunigigomidit.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc26727890---9007492054.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tegule.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/16071377638.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/kizutadalolapip.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/98354352565.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/vidiwowoj.pdfIn PDF document text
    • https://educhina.mn/editor/files/25074188586.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b260da72013---73061241278.pdfIn PDF document text
    • https://wrd13.com/force/file/74632902219.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/966d300b8d91126f3b7fb20d23c36012/3168032391.pdfIn PDF document text
    • http://patroha.hu/file/ranasitux.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d549878d32d7df7ef5f5be898dfa3163/fafupedojeziluje.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae88f1a85---15106489288.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/39280622369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=learned+helplessness+experiment+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_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 10700 bytes
SHA-256: ab75e8a7c7d1ea2f7f2bde7098df8da89ffd76cb915e56bc8737e968199c54a3
font_01_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 18332 bytes
SHA-256: 985de72b52d2b93c890e42f09485dbbb51775414b33e1baf5fa2d03e40e49ac6
font_02_sfnt_off00014204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1