Malicious PDF — malware analysis report

Static analysis result for SHA-256 8686fa8de500a22b…

MALICIOUS

PDF

97.9 KB Created: 2021-07-05 02:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48b7a437429f8cec4e1d61d3a135d939 SHA-1: e8a51f27eeb157092d9b0eedab3aaae35a4c5192 SHA-256: 8686fa8de500a22b627a8cec41aa076d088a1d605b81bc6d94574846f5ceb65f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cructi.ru/uplcv?utm_term=a+movement+along+the+supply+curve+is+the+same+as+a
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/delel.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d920304147---zegegugulobisezilurinidi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b558e894892---xagegiru.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160deff8e4f44a---kivexudovivakifoso.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0a64f3d4---vuniso.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b297376f1c6---17964518258.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160784577e2964---nebudu.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8871bccac5c0604b0e31404fe5609b2f/wevutowubaj.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5b6vqmit56pf55u1b2e3sktlsg/11465588756.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e9cce2af84dc815d336b6af17e6c8ec1/bozupoxisefumibeto.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5b41d2360c57d2540602c8372af0ecde/14351565068.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eca7153ef---loduwu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e74d1cfb0---92408947805.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845224c3fc---36514771165.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1f45b2b348fb9f640f94b9edbf927b8f/71471701263.pdf
    • https://olterus.com/contents//files/gumusonidineve.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2cc9304f0d7c8657fe2a8fb8ea81c0a5/kegewo.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/affc48d429d8d7482e4605300867ff54/91273877247.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e705bfe9d---70884839855.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c08a4b09277---9874715233.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f6372a1e04b5c3d154ac676068c100ab/guwugog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ba8.bin
fc2723e7fb944bbfa76006e0c2cafc8f7b9b9ae98bf8244094144da6de447d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 17296 bytes
font_01_sfnt_off00014869.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14869 16792 bytes
font_02_sfnt_off00016080.bin
3ca3c21269785e0c0275c22cf18950d3dc9f006e42649c34f2509a54f98455c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16080 11084 bytes

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