Malicious PDF — malware analysis report

Static analysis result for SHA-256 3766ca06bf91b03a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 18:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a859db3280ed39ea8502704c3ac427f1 SHA-1: 22b096d8967c6cfbdd600146763b22164e0e982b SHA-256: 3766ca06bf91b03a6b2c313c82a23d99b7b9e09db5e03218bf6e3e427b61feb6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=political+stability+and+economic+growth+pdf PDF link annotation
    • https://durgabas.coop.np/ckfinder/userfiles/files/81236344780.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c57405807---tebixiro.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/bunipulifoli.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/8154588176.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7c2eae99---90657138829.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082516cb9251---xusamaxuwulotupufapetola.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/62520941994.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/23718982855.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/31655803990.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/rotibeliworomugebu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610563fa7f39f---82692022560.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/49359294584.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l1fg57r5k4pkvcc3lsjrr36hbn/34671166175.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/magawerezenuwowomovudixe.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/93726107401.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/demilepik.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/19416624344.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/22158467250.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b7f74bf08---mejowitemelowaguv.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/pogekonari.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/vivawemoxekulipobamufonux.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bisuwubuzudotalavavawo.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bcd640ea64fc10b230ac8c75b2d22fe8/jezasewawugosoxot.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_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 11408 bytes
SHA-256: 788fcd11c1535299d7c6260d421c4f302fae6c3852d36e8b19068e5a7fba74a5
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 18252 bytes
SHA-256: c26f56a8a70258c95db1fc190024b50ba24366f8abfad4ce021cbfe853a39835

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