Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fcfe279e2ba93a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 22:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b093cd6cc6485866ddccf7d66d9f98b SHA-1: 01b47ce17a907f850bfdd492aad1f4450d11af93 SHA-256: 11fcfe279e2ba93a5bfe6d7d12b292b9f2dafd0782c38a20c07891c512b16d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://laborke.ru/uplcv?utm_term=predicting+outcomes+worksheet PDF link annotation
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0c074d767d9805599c172dc30af49b94/nikujuloruf.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/271284963.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4aa33ca0a---faropefezosuzi.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/vuzopazevumam.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/48272326223.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210706121644.pdfIn PDF document text
    • http://ligneus.hu/upload/file/26507356639.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/87320601386.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6593b9b421---17823128857.pdfIn PDF document text
    • http://generaldistco.com/images/file/rabov.pdfIn PDF document text
    • https://areicon.com/images/file/xofubabimopelugu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a290628e982---67178362000.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/61128386972.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zebibisironigegovo.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/7d61869c853f6e2dde651b4bf3af05cb/fadulowamasap.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/66868675202.pdfIn PDF document text
    • http://yuha.be/_files/file/47493633552.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/80737736615.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ea3c1207331f5af5ef28d8e687eacb3c/39445120203.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/mubazi.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/wevurejinodadijefoz.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/45494621624.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/77513448233.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a451c5dcfac---94245202976.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d223afec---51775723134.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/5321640498.pdfIn PDF document text
    • 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_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 10888 bytes
SHA-256: 5b6fd63825a213b39f970cd8d324b4adc8cae3f51894667046d082046a52eb3d
font_02_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 17484 bytes
SHA-256: 3ecbec9290bd5b036f3e3ea0da2c6839a67a8ae04f4395cd1de20d9c6bcf7901

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