Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a9b892056a5ca9…

MALICIOUS

PDF

91.2 KB Created: 2021-09-18 20:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b388ffe9d9dc5cdc65dce5f6b20f7ede SHA-1: 0ad453a4a8c0715dad06c6ab9b781abfed085ca3 SHA-256: a4a9b892056a5ca94e76a26fb2e3b818c530f863646c8dbef1192c850637a26d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=mobile+pattern+forget PDF link annotation
    • http://studiopedrazzini.eu/userfiles/files/bokukujireje.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/21387808335.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/95006637398.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/49159080678.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/28596486121.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63ba2315d---28011341232.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/75189887782.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/27705433727.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujapupegu.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/171135182945.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/83842496615.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/48658884724.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/20635514470.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/mebogafisariza.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/fabesikabibu.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/vukamexum.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/1556767460.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044c09cbed---tekomitaputexoponigosel.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/38529725413.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/jemetoxase.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/lolifobegawanixubu.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/41213397507.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c9ca1cb9dc0dacd692fbfa81cdb04cbf/pirorimesa.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/8509903538.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 16208 bytes
SHA-256: ab93ea953cd73bd5c1b6b1e20ecea8dc94c1f6ccf43145c9f97a19e4345a10f6
font_02_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10496 bytes
SHA-256: b78202139049907ab5f4137b584fc305456dc2785723a8d9bc68af533893b132
font_03_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 23196 bytes
SHA-256: b9f6de0e4b48e3c8b6ba930d0dd819720891666e7315f64f82357be7685e414e
font_04_sfnt_off0001467a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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