Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c46e1c5dfb801a3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 10:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48fb321ad0601c0c6fd25b63fe3e3e88 SHA-1: 90b04c8c766ca80f3599f255fbf1ab285af75cc0 SHA-256: 4c46e1c5dfb801a3ce640796c06651def090c0c2c99cea044f1b717927c15488
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress upload storage and other disposable hosting sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/vefudebajokotadijafa.pdf In PDF document text
    • http://rajskiewakacje.pl/userfiles/file/36226937642.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/xodakenuxawa.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/towiv.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/gebofekukeb.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/vodiwisalamojukas.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/basavuterepawu.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lumike.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/teseg.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/969227422.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/kasinavazojikavefulomo.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/10712648436.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/51840409862.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/74910162661.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3373908abef0f5fdeddfda8467c47147/21993126313.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b5b7d2e74---30164611459.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6391ca68---64087418234.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/40447777828.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a81b35ea4---vobivilakadaridifima.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/letazinekugamudekidafowo.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/muravifupofakokero.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/majikixotavuzer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=latex+chemical+compositionPDF 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_off0000b53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53B 10600 bytes
SHA-256: a15c7555482c835b6137f6ae115915c4eba5636aac9990621817f1fe9e0412f5
font_01_sfnt_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 15500 bytes
SHA-256: 0500a2c3c039f2d76256e8e74242cc27a47928c44b04d26167a769b11dedab07