Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d236ba7ba7a55d8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 06:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 221439e3c6658619cdb2bbe211958462 SHA-1: 895d770a340a1e0afc6753dc92be3a8da95849b3 SHA-256: 6d236ba7ba7a55d84c6944953f53b0188f8121713e1a19658423efa756bf370d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities. The document contains a large number of external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of numerous links on disposable hosting and the use of UTM parameters point towards a coordinated effort to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=classification+worksheet+biology+11 PDF link annotation
    • http://preserveproperties.com/userfiles/files/numasevivajupazuwilalo.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/73887939937.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/78e1561487b6475f23a952fb5733bd8f/bonazujuseluzalapunamom.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c431e8745b---26141244171.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/dozexasudisuvorexigilele.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8f2e183e9655b89cac8ad19084de0cd9/54547179694.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a622e3a343a---jadesojuxefefazatuvexix.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1fed1a13505d4d236c33517b1583da39/96405449616.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b8cb64abff654b2c4dcc52fa1b91e111/megiragonaz.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210814050432.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56087461525.pdfIn PDF document text
    • http://dnepropress.net/files/file/gumodifogigelujojaso.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d8370b8d0---51455581703.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2bf524866abea3df35700f1a4a2d9166/23349596976.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/40916604071.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mcs9v08ithpto85a5tfl9e7f9s/10615453881.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/mawurezevi.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/84567507417.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/lisoxinuxabomikunez.pdfIn PDF document text
    • http://sakem.org/userfiles/files/suxonewa.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607002259a3f2---33704159169.pdfIn PDF document text
    • https://btegypt.com/file/buduwatasoxixipisuz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a409326c1d9---kamemaxoxegakub.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/50028615905.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_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 16976 bytes
SHA-256: 2f53b1508ff39e02d358a591ecdd9685449b6a0db0e146765528ac87ec9a0215
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 11128 bytes
SHA-256: a1f16672984483ebc6f572bb97be61983641a103da777a13731051f0b1601ace
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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