Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23c13fac7cbd7f5…

MALICIOUS

PDF

78.9 KB Created: 2021-07-08 06:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0baab7ad34b71b7a8db2bd34c38bb8ab SHA-1: d398dcefe0f30294f4932e0c333fc013f68e06cf SHA-256: f23c13fac7cbd7f5b3c1fca8c62f3e34d96a5a8f9a9fe464bb7b9e9ec2c0d7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=tendonitis+toe+joint PDF link annotation
    • https://rosycaffe.com/file/87532709443.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tevezusudevawomaroxivef.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160990bfaec5f5---56469067632.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609676a3a44e8---wokomuniperimunedowoxuse.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/88a8a232a2ca2e528a3829ae6d61e3d2/38183953380.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4690fea9c8---5657381583.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091774938bf1---zizukuxikibaxiboxanixara.pdfIn PDF document text
    • https://brod-plovdiv.com/images/fojozogapomerixakeg.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c08dd88fb---biwinamadeva.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/64370911963.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc27cf02f---temubopuwi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8038281a1---dedebapanifa.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8689b3a441---madunebolerexex.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/74472952819.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/fujazuje.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/tokimatipopiliwajam.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b150e592d86---31543763507.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a556b37e310---zojoduk.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/liwomabopenokexin.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ffc6d6e0---givudarifik.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160703ba82c27d---fonanakadarune.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3ad2dee8---37420285654.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/84535335171.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/nokoxajuta.pdfIn PDF document text
    • https://baptistfriends.org/media/62387569423.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/segazu.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_off0000d3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 10024 bytes
SHA-256: ae0502b2f61cd5759531fc6a29953d0eeec1a2352c62389a94d3c87dee73415a
font_01_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 16620 bytes
SHA-256: 81edc8435f2f614724057bd0720eeaf00a6ef8ad326e57d7c09d1040c4f0317a
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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