Malicious PDF — malware analysis report

Static analysis result for SHA-256 57015330bf3e9b0d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 05:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4f3242b7426ae945e8d09f38de941b60 SHA-1: 1edd78a076b1e003e95ac8f4bffcdd0a68017339 SHA-256: 57015330bf3e9b0dbbdf744e171459c1dcab5f99a910854031b83883460af7bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pistant.ru/uplcv?utm_term=introduction+to+calculus+and+analysis+volume+2+by+richard+courant+and+fritz+john+pdf PDF link annotation
    • http://samtle.net/ckupload/files/66469624935.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b33c8096---19751877474.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/23ihm3udelnd5vo5g4unp0hsk0/vuxoxukasivinafiduwisa.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/85477352207.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/81805863843.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/f2nbnatpo5rm43tcfsci3ejacp/20261158653.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/87479469321.pdfIn PDF document text
    • http://lactopad.com/uploads/files/50983509404.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083f737f1674---87604833305.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607401a18e36f---94311882953.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/dodimomat.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6762_20210706052218.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ecb76a54---verelojabisujasedi.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/wuxavasunorexowotalixov.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/19002329790.pdfIn PDF document text
    • http://vtaky.sk/media/file/68106519345.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fotomurinamagos.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e46b595e7---jetejavizatarelo.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nakejok.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/9175067932.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160acb2701a030---51276544580.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/58697351758.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/mumisitewogebinugom.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/31295350504.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/84253483549.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cl5pfn70s4bfi2d7fo9ukempei/289815432.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_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 11564 bytes
SHA-256: 1ff6dfe6a167d9fc1f39aabe5f1a44b01df80113788e0f04e4e2e55985470a7f
font_02_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 18040 bytes
SHA-256: 39861e91e01da7e252f68e3c52c2c6e4b5d8500eb1b25cf57ce7a00a8abda7c9

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