Malicious PDF — malware analysis report

Static analysis result for SHA-256 460bd49cdbccc1b6…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 04:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ed8eb08feb3d97b6f445c12ea5a2503 SHA-1: e43908b471335a450df99d0a98ce314d1c771eef SHA-256: 460bd49cdbccc1b68cf7470ba28bb5b14f2570b36422dbf42682a6af37798e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites or facilitate SEO spam. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pistant.ru/uplcv?utm_term=multiplayer+zombie+games+android PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/coee2jfls22e53d19aclthjj02/77514868132.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614327e87b515---vinekagupomovulofaneliw.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifodegur.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/baxizog.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fifoxezebuk.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/kabarokiwosezunerudi.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/poc3e2dme8j6n20s4nk8neqb80/16036173922.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77cc4f965---24592838570.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qap0tg5skcv7h42306kgdk50o4/tizimabun.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/poxar.pdfIn PDF document text
    • http://konberdbio.com/upload/files/rijexesifozumibukodalorab.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/zupinujaligig.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/84357677440.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/sunewawowozijetix.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mosopogadorawaxigipuziva.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/widoloregokirezisebebesil.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/17280238151.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7bf76369778d5f8d6abc00bebda5b181/jagoselejexisu.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/penozogapubelu.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vuwulirawed.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/29710518383.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/30813498982.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/lugolav.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/68652481093.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0a0c109c---21616583307.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/liladelun.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vamivoditozuzabab.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_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 11144 bytes
SHA-256: 3a3d74dfd3cb5f4a6551c0b831a142244c1f3fcf5e6fb5e8c79289712b9bb2de
font_01_sfnt_off00010de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE2 16664 bytes
SHA-256: 4aec3fb399c9acdb2f96f130994cc3ffb73c59a074c691f2eb5aa743d36762fc
font_02_sfnt_off000138e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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