Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f858cf25db45151…

MALICIOUS

PDF

85.5 KB Created: 2021-07-14 07:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bf1f67ea036386157e788c28b86f399 SHA-1: 4da16c6f113c1d34013743df853387d55510be8d SHA-256: 0f858cf25db45151a3e50e4717cc4e5bb9dcb6834aa5f0c27dd3814d0dcbe422
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and numerous external links suggest it's designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/95659714679.pdf
    • https://pharmnet.cz/ckfiles/files/files/44425442543.pdf
    • http://clubselectionvoyages.com/images/file/59956039277.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797fa2483c7---33289732411.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/01291247a25d6fad99080f4ec455fba8/44963354682.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/fupodotizerunoradasu.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cda8309f7---kasokesijodefenaw.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/je1l96h1plgr9k23cugn7bepm5/disuk.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ca5e8567---gibofuzekutiritosumi.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c2d3a4a8f78516c62bfabe9c505fb6a7/34876370251.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1e687289---29256818817.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3acde0a5c---51505401308.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/11a98097c1a3ca63e18ba6d9d57f7e11/70650296156.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160708cfa6d8a8---26128048429.pdf
    • http://baugeraeteverleih.de/benutzerdateien/duwojito.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a219fa89db36c590a93d46d88287246f/vuludoxoboniwe.pdf
    • https://livre-d-art.com/ckfinder/userfiles/files/guvawov.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hmfnjktfg9f1srqga8ip4ju7d5/gixomisafevosawigipasodu.pdf
    • http://choinka4x4.org/cms/files/file/timedevobezirawowetimuked.pdf
    • http://abnicum.com/files/file/22929881681.pdf
    • http://capesociety.ca/uploads/files/ragawupuduxewe.pdf
    • http://abnicum.com/files/file/bataral.pdf
    • http://gtshotel.it/images/file/fojiromelir.pdf
    • http://alhouti.com/userfiles/file/81578142002.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/fuzobalolusuzegeg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hydrogen+and+water
    • 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_off0000ed01.bin
396e73657dd4b8438bd762be7d265be0d4d87b29416be2729954a6799fbbcc71
pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17292 bytes
font_01_sfnt_off00011990.bin
ee82f9f32dfa2d0fd9ab65ef9669b532db1c615f7676fc436bbbd906273513ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 10308 bytes
font_02_sfnt_off000130b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 16792 bytes