Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd90b86618d1002b…

MALICIOUS

PDF

75.2 KB Created: 2021-06-29 04:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8809e758d5cc9191d70558498c426e6 SHA-1: afb73255b5b5bb633033ac65ac62e79575821ea6 SHA-256: bd90b86618d1002b4d39a46c493f93f7fbf6265f79194c174a8b0dcfd8e77e87
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 a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of external links and the overall structure indicate a likely spearphishing attachment used to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://tkquiz.com/userfiles/file/54828641503.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75420862c00779a383783ed8af0c733f/rodijibobupupadurowa.pdf
    • https://aymsoft.us/aym_image/files/81330018375.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe8a1170e---mekap.pdf
    • http://aaaexpressheating.com/userfiles/file/21944828351.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b57a88e60---94165233990.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/50hqsn72o7c1im5kmd1k5djvs5/59330697802.pdf
    • http://banphimchuot.com/userfiles/file/4400920486.pdf
    • http://polyalpan.hu/_user/file/guzamatezifamitaduket.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7d574a3ad0d72aa0f53f85f5025ea610/77667138595.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b618464fa097aa4c23039ba011aae8a8/61027426584.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6375470e---33514264049.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f7a123eaf2f7a6b50aba6742a773f37f/timabitezeneta.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/bc35b53b6ed891edd623e6401fb0d201/wogojosil.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c5115b6dc7d327f52159cb942cfc6934/tadufovumivurux.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3d86ff2d047bf2e6e4decad937a81618/77280473744.pdf
    • https://snqrsl.quebec/upload/editor/file/dubugikogazetexomupu.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kfkc0357nae1rbpla0rcep3tt7/sipaxakujaribolexedoner.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e697ee614d---duleneruki.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1fd48cj1situcbbmooogfvp2sr/9586884425.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/imblmgggfn6p56q8iiqannrjn5/26994958811.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072a46212751---baxudesedenotinumuwig.pdf
    • http://mwflower.com/upimagesfile///80872937673.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/5678602912.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=in+the+end+remix+mellen+gi+mp3
    • 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_off0000be5a.bin
d75eb79969e2927fd3d0725a7f99db5a083e26b86570892523fe62225b96a61c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5A 10616 bytes
font_01_sfnt_off0000d628.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 16792 bytes
font_02_sfnt_off0000ee3a.bin
65a19484df0d5c15f9ed13286457a6fe73c4ca2bd3b53750c269b6d2b44fa4a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 21788 bytes