Malicious PDF — malware analysis report

Static analysis result for SHA-256 0269c9c049c40492…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 21:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ec2806f1aacfdbd2a7192c68a403fb1 SHA-1: 0565f15c511066716cd78aeac1ab3616b2944344 SHA-256: 0269c9c049c4049250bb81edea7a7ff57904cd73b12c4e12d035008d11fef2c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=print+pdf+excel+vba PDF link annotation
    • http://bacsiha.com/public/ckfinder/userfiles/files/44067845050.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613781ad0368b---84388122594.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/gozazekisemeregatefijob.pdfIn PDF document text
    • https://clickbox.ro/images/file/gekoxuzafatazepiwubuno.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/lebebadipevipojudebijewa.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210907020212.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/ripiwotudabefigigogada.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/nadapanatozen.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/4872100564.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a920712ae29bd1ad9f6434b66527ad4f/91039643248.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef65c3fcc---2557179855.pdfIn PDF document text
    • https://novitas.ro/files/vizakeda.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fituveratozadulamibikakus.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613484a761124---30771633714.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613138c91d6a0---93356235414.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/sajufopiviwapolewe.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/bokugebasu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/16544277406.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/zutodapanezeseb.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5mokg7e53r7mc0brab8u25id4d/rupowujesonabebosesarelef.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/47316859081.pdfIn PDF document text
    • https://thietbigas.net/media/files/risokejuzodarazopeketib.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/21c7000637d4c3e46219e07e328c3c6c/jabap.pdfIn PDF document text
    • http://ebus.cn/up_file/file/bulezazidi.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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 18348 bytes
SHA-256: a5a3eec0ae390ca7a9d239aa14897f3af0fe9a894d526810a0131c48ca2301ad
font_02_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 10632 bytes
SHA-256: 7b70150bad4f0949cbb44d65de2bd50895af70eac5ac728505e383093fc4d697

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