Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1852fa97e39ecb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 05:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2c0027b7770d676b389502d3ff29e5e SHA-1: 40a6bf0bd29662b7c535ca8f17cc85b3409ef64b SHA-256: bd1852fa97e39ecb857189beeda8de16cfb2a1d44f78537000d94780340f1256
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://drironcat.com/images/file/76226314434.pdf In PDF document text
    • https://gadd-asso.org/userfiles/file/zorevotezukuguwaw.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e4b716fc576e0b816bb04026b158f5fa/24879112084.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/85798817173.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/46137282162.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/ketesitupuga.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6421859b4---94095670378.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161392a33bf784---wufefeziletubuv.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/buxugixaxurunozivovanif.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/lalituzizajegi.pdfIn PDF document text
    • https://nada70.org/userfiles/file/zesodenikemodidafixusezi.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/fopij.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/13560525101.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/97816880310.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/48975576359.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/fafanibinigusadisajuguxol.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc88a7ec---kixobogolumojil.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7daef714e241df6b4d5e3b3f61842656/xewovezogitebi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0705e0ce7810df5bf8b369a5472f4fc7/subobakinirawu.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/tuzab.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/vixiruvekotaruj.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/47960195478.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2193d3d75e782bc6e01e9fc5ba72a58b/24429511816.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/69959380461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=compass+on+google+maps+androidPDF 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_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 17140 bytes
SHA-256: 0c656c7998135f5ecbc8f98b57f69ea48afde4184fe96488bf5a5718114bf668
font_02_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 10668 bytes
SHA-256: bdab2cc92e22affd8c91cf2594076796272bdc23f7b82367c75014e3afe4e029

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