Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6f9fd59004b9a1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 03:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cbed105f6993009daa95483acde3d19 SHA-1: 18323497285a083af310cef7d0c1dbba8d8ff4b3 SHA-256: 6d6f9fd59004b9a1e48109adb9ed3eef77552a18eeffcb746bc59f9404cb0552
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=oracle+data+mining+tutorial+pdf PDF link annotation
    • http://faithartists.com/clients/877397/File/romowu.pdfIn PDF document text
    • https://capecoralliving.com/media/file/26256587632.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078909f80429---mifafasi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e75e7cbf016---48464343484.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/14481095776.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/41550897961.pdfIn PDF document text
    • https://badoza.net/userfiles/file/duruza.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5jkju23ri9cd670o47jvnd45c3/salovav.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b225b32aae7---59830259274.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/15071300787.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/813707285a34e50faba02fab89cac8f2/nasamomejuribemudi.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/k2k5h7n8p3rf4re8lgkbi2or5c/8809417405.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/62e23e8a336b558aa200d3a44a1ef6b5/daredipowediruzuvuxet.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fea9052f28---sidesikenaz.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/nigujafe.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/31937953267.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/funudidajuzawagewesiduxo.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/wuxopemirab.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7e55545b4decfd5b458d5b1c7e5c2bdd/45410459946.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/54227448365.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e830fda8---21435576235.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2c4f1fb0147610fdcbc8c3f935918383/97097750539.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/48217603084.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a2h50rff782ppmi4i8j39c6935/wotelirubuzonofov.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_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 10920 bytes
SHA-256: 55689579317c118a292f5c79560f6e5e4990fffdb2139a5e9576ef8367797b7a
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 16676 bytes
SHA-256: d5dbc80b63407fded6e0236bbcb8b9e2d6ec130b9f4e9c9f22c4c0d2a4a876e2
font_02_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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