Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2944599c7834cc6…

MALICIOUS

PDF

101.9 KB Created: 2021-07-04 03:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f5037d79fa56f68de8c8a65da8ac21b4 SHA-1: 5aa1b93bf9400ac007d61916f05e16c372ecfa1e SHA-256: c2944599c7834cc60eeb86987d350471ec16545612e9b6078fc2a18aac09ed4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160760744aaeed---korizarajejumu.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f35da48e---benopezox.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/sapupetuvimoru.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40b1145ca---silubizuda.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/hnoq4vmeo6pvb3eamn4e9tffr5/95370540971.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/11fc6704ac6c2b87804a737ed9794b54/3327374286.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a819f41eff8---minutepijidotozefalu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9ede0131a---xamitaxitotemedefor.pdfIn PDF document text
    • https://digireg.nu/upload/85107912586.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/rotuwubekovekulavafipi.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a27c237da---jabepebisodip.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/41da290a3d25cfd8636a0f49101b9e70/94401868941.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/23914936803.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6qqe6nncvgro48eotjkj492r94/potut.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bae298113ea---sebadafo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/d5s014n0mm221hffp5ch742td7/wuxogekudetonu.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/pefoxosaw.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ff3037726---pubowewaza.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/1b0c1c37e25a0127c84a9f0bb7b2b4c7/17283654141.pdfIn PDF document text
    • https://semut73.com/contents//files/zotoranotipi.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607419cff29b3---ledinijodixagariben.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d4350b113d4bcdc8d40a361ebb3e664a/27325347712.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b0044af371a---7349980784.pdfIn PDF document text
    • http://cmtsport.com/pliki/surowuwiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nefarious+meaning+in+englishPDF link annotation
    • 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
stream_005_off00014d92.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14D92 19776 bytes
SHA-256: 438bb8f53f46b1f9ab079fc8d0c7edaf8ec4e65753268fefa0e6a82ac3599cfb
font_00_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 10640 bytes
SHA-256: 58527226e5d67c89a95f0450e83a9e1430ac102d5342f78a39b3473bafc6bec8
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 27656 bytes
SHA-256: d94e8cacb25b3504f473625172829ac73e522fe8fb0acf7855f710e80bcd117a
font_02_sfnt_off00013bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 4848 bytes
SHA-256: 11f7e2500602c8865b617be3419a0ace8ab4765109531800b8df93898aa14929
font_04_sfnt_off00016f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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