Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77b2df7000cfe4b…

MALICIOUS

PDF

89.7 KB Created: 2021-08-16 19:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dd081275fdc0291ebf67ee69415df2a SHA-1: 4b51152e8acea754a316e2ee75dd02c33e9738ce SHA-256: b77b2df7000cfe4bc3410c04c43fe0b3048be879a04503e790b3b2df70e4b77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://maydangson.com/vietkiendo/upload/file/siwenu.pdf In PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/resolivepanivosenodeba.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d37919545c---vefatasajujowevibebixav.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb35c30eb8---85279509861.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/bevagibovelalodined.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/ravowatanojasonatak.pdfIn PDF document text
    • https://emenu.hu/editor_up/78940838722.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1af3285962a99d3b85cd0e4e48d69e56/59583128244.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79b24c496---vetagepenupuwovujuruki.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/joledurisazopet.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/25871780812.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/53511643152.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68fb0366a---zopiwabunarumivokav.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kebirazoboneneraxevileje.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4644a3a47db391fd178a262bdfeec73d/95560320818.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/16025139954.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/vusizinulanijetupigaxozax.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c6fd554e8699c5d8211f915fc55f991d/77830442068.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/66779658260.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c63805944---zekezogevusinobafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=daily+forklift+inspection+sheet+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10784 bytes
SHA-256: d9f13ae655c5507047b79d858d5c984958202bdb9b957d39bc54c99f13ad0fac
font_02_sfnt_off00011406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11406 16736 bytes
SHA-256: 9472f6ed9514fe8a3c142569e522ccdad7d59a7540cad3eaf8d35b4f38d0f614
font_03_sfnt_off00013f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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