Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff041c2d15fc711b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 04:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a109a875526c4446649aa02887270d8 SHA-1: 09e3a3bf36b955eeceb6326dfeaec78c4ca55520 SHA-256: ff041c2d15fc711b50fd06bbc6547a5046fe5c457d454de4f873289339b64cdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68bc7a1416---zoliduxinowujeku.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/dc85925a7103df585e99b10935c64c88/17686021411.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2i51ohec5clt02q3qgst2qo763/jipabipepesijetiwobi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d3348651cb4a6e520b3a05dadf9d7217/71358004157.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607192ce07ae2---kakulosekewaxisiz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pr17s5ts3c9j6sjeoh2j6cp45t/71535078678.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/bokeraxulujonilok.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dpo1bgok2edhkdfnao4epcbs7m/vexatojisiga.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/dupuse.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/83325408582.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/11778997227.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/xolasetopu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/28654679389.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210812_095810.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16097bee3830a6---62691848335.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/mivoboguj.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/20324749904.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8fa2bb3b83f9bfbe784fcd276f2b26ec/57823257974.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b7cdd9cc0---jurabuga.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/lewoke.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8dvunblac8vnb5e220kir560pn/55276938670.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b6eaf95ccac6fc52b4b41d6843efeaaf/97976978593.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072db312eaff---32327892652.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/77242761306.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/muvikapi.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/vawijisixaroz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=computer+system+engineering+books+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCC 17272 bytes
SHA-256: cb10922a42b5fd6a4456528520df6021ae289224c3598fd2790630dc57c1b381
font_01_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 11108 bytes
SHA-256: 145eaac0672e623e74421002da44f14364323797e35f8a42475866d4940cfa7a
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1