Malicious PDF — malware analysis report

Static analysis result for SHA-256 449d40a6daa5e1aa…

MALICIOUS

PDF

81.9 KB Created: 2021-06-30 19:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30b555a9997522ff4482f642fc2d5b05 SHA-1: 7a2ffad9428637ebb1c42fa4f73f64d10b761bff SHA-256: 449d40a6daa5e1aad250eced76b37cdfc265a690b0f35d18a9350738d58d1eca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to various websites, some of which are hosted on compromised WordPress upload directories. This suggests a phishing or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pincailight.com/zk/UploadFile/file/2021061804334073499.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd615057b4---81193267117.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a692626627---92467394617.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd1f73026---zusurasapumas.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/s82p434jgtg2dudgtngfe5dbg1/xojakuweteg.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/832fbd56fa2190aa95467cd7187ca3e7/25605385459.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/34659725761.pdf
    • http://tremonttemplemacon.com/clients/862779/File/83546070986.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/jimetorituvixem.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/064452d463a323c07aa6023308ea0581/gelidisozu.pdf
    • http://curry-box-deluxe.de/userfiles/file/14619408781.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/954611df80b9df8ae63ca7bbfe97c5a1/fejobadavogisanojidubo.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/444b2efda0d856a77979c353f927e895/82052338437.pdf
    • https://kontiko.com/ktkweb3/images/upload/files/86911793224.pdf
    • http://allamericannursing.com/userfiles/file/vatusonezufawosopofexa.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f06b20900---duzasobup.pdf
    • http://yjsyrj.com/userfiles/file/zifibozimunenazub.pdf
    • http://teplospectr.ru/images/files/57690564344.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/78401567486.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/66a65a05857f853f4b8e8e4ac4215554/46777913530.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755dbc3be5a---jarejilazifojaxogavibob.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4185s0m1k9ihmb1froh54p3eoa/jejurufebemovufipu.pdf
    • http://alisawedding.com/upload/users/files/dizedu.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c9745ac8647f9e77e4c963de39b73791/65640989148.pdf
    • http://bogelaipigeon.com/upload/file/64662156820.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afe65cd438f---levesibamipumumabubir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wrong+turn+3+dual+audio+download
    • 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_off0000de61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16792 bytes
font_01_sfnt_off0000f678.bin
b583ca4bcbb8a4a234c9772cbfa8f5b0d7511c517fd9acd293d166a337f26a71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10472 bytes
font_02_sfnt_off00010e32.bin
cbf48340eef98506c4cd483d81899009c6a0d6dde101bcad427907caef89436b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 16764 bytes