Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84b45e88e4ee14f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 02:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba40ea3e270f88ed54c7019e49391a2b SHA-1: a0ba5b3e9032f9b0e2af98bd7505d341d4758399 SHA-256: f84b45e88e4ee14f96f8ad9dbef9b496de215f1c5d307ddddf421ca764e5c431
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the malicious intent of directing users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bandai-k.com/userfiles/file/pitegejumuweliw.pdf In PDF document text
    • https://boyanbolyarski.com/userfiles/file/53122775594.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/03162658396.pdfIn PDF document text
    • https://termocasasrl.com/file/papoz.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/fulegupoku.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/552f2d0b4c6972b0699fa22471234901/88773201556.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q7lmklq46qcqvk9tbrotpj7j3c/42289836878.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612e96127df38---lirudineladotudul.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/gagonege.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118274c7dc05---lirusafotom.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c748d80fa43---badopigemaju.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/65524258612.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/36062521892.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/83057329361.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/24124406503.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/timomifafu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/8797856491.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a13f3e6f---38263133003.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/bojevumeweva.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/pesirimutedokixakanavik.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/1212707200.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gugakalotadefaxirar.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/45272351665.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d1029c889---saxemalimolapopiteniki.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/24528484032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=physiology+of+digestive+system+pdfPDF 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_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 10760 bytes
SHA-256: 8670bd77c6d9be86ce4fcfbb5c42e883f6cf2b9bbe6c68f28b26a85024ba5f2d
font_02_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 17316 bytes
SHA-256: 299132fe7d13b81cebe04ba799e9c916a9db2b9aafa14c17c0f3401b33282c8d

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