Malicious PDF — malware analysis report

Static analysis result for SHA-256 f062566d19a799ce…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 12:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c9c79448fcef9b73523cf553cf1a531 SHA-1: 304359bd5975061f75adf4b720bf243e6268bd9b SHA-256: f062566d19a799ce22f0d59405424d1d32a8273b4bb4005fd0fee5d4e0e40a35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it is a link farm pointing to compromised websites. The PDF contains numerous external URIs, many of which are hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=communication+systems+simon+haykin+and+michael+moher+pdf PDF link annotation
    • https://aristi-trap.com/upload/users/files/komavizotobuwez.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/9336558280.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/ledebudisamig.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/sajadujuloludadozasuduvox.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210620173228.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210629_FEBE89A024E8B352.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/88061832518.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/91686722567.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/bufabezijelijuxupijizi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3312e84403273387144e308663f55904/83985684658.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/4834776565.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/fonabojovixudajepitugavom.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/95465379448.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/kewizufugetonujoxole.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/virabesolemajede.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/makor.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/48bf6bf0805401dc13421d8cbfb2d706/36909418732.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe39859ee---36487770603.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/50956734874.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/jilesa.pdfIn PDF document text
    • http://medi-sen.com/files/files/redobutekalizigapovikobo.pdfIn PDF document text
    • https://neplatnasmlouva.cz/soubory/rulogusuzewaj.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/44070296039.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/39681415873.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bfa5ddb0c6f9cc77c8997ff70143b7ac/53198666004.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/funidepudosuxazobonir.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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 17116 bytes
SHA-256: acca4c34ae0f183532f4c4f6d602fd090cefbe6e912f2d21fa60e874efee0b44
font_01_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 11220 bytes
SHA-256: 7531795897a17eee2cac502edc1f5b8a048a9006b93dc1c4e1672acba9c00e97

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