Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd04c3a04a76a94…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 09:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb05cee479563bef3df3b98118dc06f1 SHA-1: c766ae3fbc5a41539455e1ee5a43c044f49fe016 SHA-256: ebd04c3a04a76a94261c4262e2520ae0bd574d31043d659b32f0c3f7de8bc5b6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL distribution are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vipnjl.com/userfiles/files/xozigekenile.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c2010e7e95d---zufofuf.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/25053727861.pdfIn PDF document text
    • http://christopherdallo.com/file/zozarugifidunijolu.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/bajuduragomoluxitezomowav.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/navokujijexofikiva.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/67d8e649e7736c4f688f750d3181c6fd/baguxi.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/54806264298.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bb58edf5---16484818551.pdfIn PDF document text
    • http://infunplastic.com/d/files/39556537286.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/gewofegesaximi.pdfIn PDF document text
    • https://stopserv.ru/files/file/54624289329.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/ninipimifijuwusut.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/jemuza.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/48902641730.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hfsnk11i4cq4he0e8ak4cnmsk9/nimigujatajosotesurimeniw.pdfIn PDF document text
    • http://xenangheli.vn/public/files/kinedegukiwubutapofotak.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1dc7d2bf5ab843e4e1095d6edcd8c4c0/fusulokojugedogu.pdfIn PDF document text
    • http://soupworld.de/upload/file/kowajejazi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/97491313589.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/09f3b03344655bc464dbd3133204a35d/verogutojeg.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/zobimidikalo.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/pikikuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=blue+moscow+guppy+pricePDF 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_off0000c835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC835 17880 bytes
SHA-256: 3fd1acf6a7deb7870ef729b62ba51b4f99ce775e1935dda50e33e0190e374490
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 10708 bytes
SHA-256: b4d9466cf8d59a88c255cf1f2647eeca53d4ffe497c8030be02cb0d3b1b5d992

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