Malicious PDF — malware analysis report

Static analysis result for SHA-256 f661a190e5726810…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 19:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7f7fdf5e370d701b76488c0c6f26611e SHA-1: 271b7195f4eb4983454fa1ee113b881b3b860b39 SHA-256: f661a190e57268107c38912429dc55ada44e881006b90abf07f0dd9366d1af22
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates links to compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=clone+app+messenger+apk PDF link annotation
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/xorisuginajaselubiwagi.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/49958708124.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210908185415_4tga68.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/tigakadelimokupixuzuxovot.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gadagima.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/nufabepumazi.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/papujuvusari.pdfIn PDF document text
    • http://allycatering.com/userfiles/70283552994.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/50274471913.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fejexifegebojor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161438dde87937---kuvixe.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/taremalusipazolemoforu.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/dulidesagunujesudaxeve.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xutesadivediwi.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/womulesozirawixepelod.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/tuvowosexesipiwidelulujol.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/h620mcl4p6nqsirr2mpuf77nhv/bonazi.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/91097216698.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/34728909535.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40401658914.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/fuvovofaxob.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135bba0274f0---81511342100.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/33253828514.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/dexoga.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_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10528 bytes
SHA-256: 53b0c989ef463b2510b78c44dbeb1a7d93430e89e64b2c726405ce8bc850a898
font_02_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 18608 bytes
SHA-256: ceb53d42ce43f57f4fba326a5774d41a456537190c4d5d01c94c5f5c18dd841b

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