Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b59782c3dd49a0…

MALICIOUS

PDF

74.2 KB Created: 2021-07-01 19:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 491b632296a18d0a062e1c86d5593442 SHA-1: c3cdb885724251d0f184b352136c42fa4cc381cd SHA-256: 23b59782c3dd49a083b50a050b38c14ba47fd5e5bbf501ee0c39f38a856ed7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://avenue102.com/uploads/file/kugalosimanirutemofub.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e785522e---35046110519.pdfIn PDF document text
    • http://exlluprimebrochure.com/ckupload/files/peniwuviziguj.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8b606aed4a4feb7556fa4e2f917132d2/tufisifuda.pdfIn PDF document text
    • http://balone.net/_upload/file///givuso.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/43c3b0b0122573f059aa16c1024d8b89/sonorojidujotuxup.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72ed608e1---71397625923.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/livegizazakaror.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/89549267360cd8567ab551.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076099edfba9---poxubiruvolok.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jubisowesidajuvoje.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kelivimi.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/jubenemomaresozafejabizu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6284bc1846---kasajepamorabuve.pdfIn PDF document text
    • http://alkanboya.com/files/file///didexugejewetikige.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb53f67b6c---50159067508.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee1b3b2c48---68055001551.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc62091455---71021303284.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/72857994752.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06c35c8de---tibeketopilemejujeduxakug.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/gewiriseraguruwazi.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/6rnade0kf93fqfbdj4tsduoe22/92560796428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=brown+red+oegbPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDC 10136 bytes
SHA-256: 5cf250c3cd9a52bcc72986fc6a61c0e89b76ec296b6aaa258290f62cefebda16
font_01_sfnt_off0000d56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56D 17276 bytes
SHA-256: f1d47abba7cb0b805dfaa2dc2ad1a74443f32e96721b3e4222869b1ebe934685
font_02_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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