Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5d3365a3051642…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 14:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b78b50ae4d455567c3de0ea37f2420df SHA-1: b3dcfa674384324be1d76975115262350fc57327 SHA-256: 7c5d3365a305164297b828d9cfaf726520c9cc4ef55f8a231d82657773f0cde9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The presence of external URIs and the nature of the link farm point towards an initial access vector via spearphishing attachment, leading to exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9635

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 https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af945761e6b---ruzajobazaviwamogupipiju.pdf In PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/38a795a1c8fbda333ae6ef083237e519/newugabuvekefutanuvegabek.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e71ea68b6---30843352274.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade69b72913---texanebew.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/satewapifozogep.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/sifovudisefu.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/piwuselafizebokudesipen.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0c39c79a---dozibuxogawo.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/gevorawuxutus.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/zuvox.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/zanebekoli.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/kikuf.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/rabimojavawepumoxadu.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/ruxek.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/34297325601.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/bikibafu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3133e266ae---1700756107.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/16386384167.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/zotetukemep.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/pufegaru.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/56052547658.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/208b95e1f0b4139d0ec795df2c63a21f/3944504625.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba7feca68---32000562771.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/aedk1q60jtoa5sv70gv9jp2o7j/toriwugadovubigivelazoj.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b82cc95ad71---98770481192.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/sakiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ieo+olympiad+sample+papers+for+class+2+pdfPDF 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
font_00_sfnt_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB4 10764 bytes
SHA-256: 7df3a16b495f40407205be9d2aab95e4e1c47df3859b01f64b14b965a62dd2dc
font_02_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_03_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_04_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 17340 bytes
SHA-256: 954939fa1d95335089c9d0903e6c449ee9d24abea48cbcf90edcbd423e5afad8

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