Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b9cddc0aa4e71c…

MALICIOUS

PDF

101.1 KB Created: 2021-08-15 16:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd460b3c717a262719f8d1b56289bc12 SHA-1: 195d00a110d6542c5f8d6482134165db59984b4a SHA-256: d6b9cddc0aa4e71c865098a37ffb7f61f69bb6a8c252a6fb2870ecd1011f3cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=tower+vortx+air+fryer+4.3+litre+instructions', are likely used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://chcial.ru/uplcv?utm_term=tower+vortx+air+fryer+4.3+litre+instructions PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2e8766e1f1---41170953911.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/umlur6pha37o0q2dj3dcmuqvkn/26907528264.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nuwoxarosuposebabopenoniv.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b9aebcddc43e69c4ca60bcb2328f47c4/89058543542.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba633a1d985---molixez.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/nifubopositurosopugivivo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce98f3841---beboromedum.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/28109253236.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/70152308256.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/74757977086.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5620fd2990---76755472791.pdfIn PDF document text
    • https://agatanorek.com/files/file/24050076696.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/watavoderawufuwuzi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fk49gakir8ks0u14nedu4g4f33/rijur.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5c2d414822a7565965c304b14b6040e4/fubijalixizazoxi.pdfIn PDF document text
    • http://qca.ch/userfiles/file/23387000035.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/25288210447.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b57f585783bf98b9e4a15eaac253d2c9/zazefesasen.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f3ce91d86---24579227906.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/78504765204.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/50968363749.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/u6lsgs9v66frck3f2fjl8hmamg/jumukagoz.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1335789d70---tofenanejafemo.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_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 11076 bytes
SHA-256: dc2232bb78a115eba090cd450bc115c82febff890717be8dc4f35f6d2cecdbab
font_01_sfnt_off00014576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14576 15892 bytes
SHA-256: c2d5bb869102ad61d80a61ed5322486608417223fc36783f944b82e970aa8480
font_02_sfnt_off00016e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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