Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2571f0ee73fae83…

MALICIOUS

PDF

90.1 KB Created: 2021-07-26 09:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 833f02fa87c3b664ae64f656f1ee922b SHA-1: 8b3fd3583731257dec40f8933f5aedaad1ef1aac SHA-256: e2571f0ee73fae83bb20c31b0aded69a8b5627906d01490f7f94b909d08d3cb5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to redirect users to potentially harmful content or exploit kits. No specific family was identified, but the techniques used are consistent with a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbfde4aad---79257501750.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6285477fd---14469594893.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084652f233ce---zexizitiribilogegemaf.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d5213f64211b02d7204c9878c492d4e5/78133147566.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae737561b---megoteda.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/livenomatotegodekemasofag.pdfIn PDF document text
    • http://metallpress.info/files/5885638001.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/zogexebokufageri.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/dutelopixugal.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e783b53425---82429565791.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6feaa347ea8778e96c3363818ed7ef61/71789591256.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f675edaae---18761308644.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/1ae35c20f020ca1cca644c5ff9d5a508/65457743088.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094026bb4def---degosapatekizekonivujowaz.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/kemirijejasomivewulexepag.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/85832431717.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088a310f2225---buvizuroduwuwizafim.pdfIn PDF document text
    • http://186086.com/upload/files/vomamudotogetabudarivamu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/sibiduxapute.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/68835919840.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/tawapekavusiginurerazi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bf3a0e797---60793794003.pdfIn PDF document text
    • https://medius.sk/userfiles/file/58093400787.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/relapowo.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/wuxifuvorened.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+should+the+spark+plug+gap+bePDF 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_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 17372 bytes
SHA-256: 2132d74e3c6c7610b2332e14f5a43eaf7bac355e48490dc532e4477a1ff48aa5
font_02_sfnt_off0001414e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414E 10800 bytes
SHA-256: 5962fe117f0f5e79e8b72cf8a3b3509f1b9b2c331b82ff39637a8c3e363f9c58

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