Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfd2b034d49a7c8…

MALICIOUS

PDF

79.5 KB Created: 2021-10-09 08:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0432b6c6d78b6422cd8990ab5c39c08b SHA-1: 5970b7d56d27c8355bc1c3077f3af4b1ca615a95 SHA-256: 6bfd2b034d49a7c8e29e579dde69d745a1713aa37f8f6beb3019c721bc9ca129
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=asparagus+and+tomato+quiche+crustless PDF link annotation
    • http://yibetter.com/data/files/68685636032.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e227a3bbfb---xigekijakuso.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/vodixuxe.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/37547757339.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/12444749038.pdfIn PDF document text
    • http://myslizdrave.com/soubory/67315213821.pdfIn PDF document text
    • http://cissi.it/userfiles/files/9659907875.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/tigilaweribelugu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/34179402623.pdfIn PDF document text
    • https://epm.jot-solutions.com/files/zitatifulovuxi.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/13086771591.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/38707427512.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/remuvonosizaxokesaturiv.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/46761562577.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f0hrk9uk7putjsvmi305dot476/79567654755.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/foferas.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/20781771748.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/vobijadotekubijenakenas.pdfIn PDF document text
    • https://shidoremicrosys.com/media/risamugesogogel.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/wisunurolop.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/wipineg.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/99337635341.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4326206c9---ligizazarirexe.pdfIn PDF document text
    • 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_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 11188 bytes
SHA-256: 134edd6c5440c46a52fcba2f39383ec76560bcfa79736e7b94b550eadaa42dba
font_02_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 18348 bytes
SHA-256: 061dfc7a43a4c90bb8dd06a9fb77b0bd94f14057ad535f147134ad4ba6458a50