Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0446f4a0bd86e4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 05:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c2139525679f95a7426e5f6f7706f2b SHA-1: da282a94ca18c11c8ebb8779065c2959950f8d33 SHA-256: bb0446f4a0bd86e4c0adb7c1819b9d97d6aae1bc3fb13b016cc885af3c34a165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various disposable hosting sites, disguised as a download for 'resident evil 3 apk'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly indicate a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for users to download unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://apnm.indexint.net/ckfinder/userfiles/files/makalurezufipal.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d403b94b6df227b67ae8c7d359509213/26370746537.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/negujojuvisebozigokofapo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3ccee8c17b1dfd492a8b15d25a4ec48a/mavap.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140115f0e2e4---72593108388.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/74961086313.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/rimizimi.pdfIn PDF document text
    • http://zuche0551.com/upload/file/70831808441.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210905001027.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/pevosefezejagefi.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/80511142370.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/riralefakevemaxupulex.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/30184948982.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/daremepipenijolufila.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/edfc7a9da7a54d87ed1a9e6320f35afc/bobimifududilojusebugo.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/30468599345.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/nidedisa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59400318010.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/rinumudirom.pdfIn PDF document text
    • https://armenia4d.com/contents/files/7758978828.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/76461982661.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/65893648860.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/63138033724.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d117e6e830---72442885006.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/duwisena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+resident+evil+3+apk+for+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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 10908 bytes
SHA-256: 5fa5f255945f8e63cf6968f8d1faa3d2a7e26276c70688cbfd00b283f47f3a55
font_02_sfnt_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 18416 bytes
SHA-256: 26140f6e42423cb8c1f81816bf97cd99964ab70cc915ad38d6536945aaa05a7c

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