Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a9d6da45b7c98a…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 03:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 583a311e655340f4f00dd40b6d71e948 SHA-1: 1ed10be6c945a8e6f56c305d88cf136c8298f9f9 SHA-256: 54a9d6da45b7c98ad24622971da854a634e188ed1a6d57cc55dfdf3cd90880c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed as a link farm to redirect users to malicious content, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/7b01535e46e0b70e896146cc4f0425af/7985320508.pdf
    • https://bloomeng.com/uploads/mivosawewagi.pdf
    • https://betentour.com/sites/default/files/file/63882157444.pdf
    • https://ferdavagnar.is/images/fck/file/2569586289.pdf
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/44416079583.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/78ee88c39cbb5f83f7566c236ef046e5/radazaterotabip.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b857c6881c5---vipev.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab24f7c1a49---riruzudakimatefasososujip.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609192cc75061---bexugutasujexaze.pdf
    • http://kahounova.cz/userfiles/file/kerupififa.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89ac876b7---22074741275.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8c9307272a2a7fbefef80ec42ccc184c/60586580579.pdf
    • http://w-f-l.de/user_img/file/8121552263.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc100610cfc---podete.pdf
    • https://tavcam.com/upload/ckfinder/files/67251087648.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67004dc63---vujunajare.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/24498058399.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210619201937542993cs8thy.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6cf19d3b---27794010153.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/c23h1hsnhai4c44asua7ebcb62/8161886000.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078075286f05---45578654185.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d471df285c---67714206936.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/lutupelugeg.pdf
    • http://sinproval.it/userfiles/files/57499244189.pdf
    • https://louvre.lv/res/wysiwyg/file/45328768352.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c599479be6c---judoxudonoxobunawiragimu.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705cf6502b3---kovavizixodebi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+hunger+games+catching+fire+summary
    • 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_off0000f934.bin
d931ea600debeb93fa155002220196aaa6ded01b81bdd4a4e34320c534e404a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 10792 bytes
font_01_sfnt_off000111ea.bin
c9285a8da39259c606000108792773929a36318bc180df6d960e153f3c7ea2ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 22404 bytes
font_02_sfnt_off00014a25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A25 16792 bytes