Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f69c7e9ff80c9f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 00:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 95bc83656dcf8a988aecd3cd65a93867 SHA-1: d7eaca163d4987ae3cf7160bb1dabfa9f09cf4f6 SHA-256: 65f69c7e9ff80c9f0c995e63d398b76d40477debc7803fa9905d9ec95e0dabca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS platforms or disposable hosting. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to redirect users, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://knshzj.com/CKEdit/upload/files/72299228658.pdf In PDF document text
    • http://foto-klub.dk/userfiles/file/vupamukefoniwo.pdfIn PDF document text
    • http://computerdoki.hu/user/file/66132407802.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7e7aa5f269ea06a063ece514b02e11a3/77074341936.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/64cf0bc8f01f3e3224123d454098474f/fidogetijimabaxidoti.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/sasenajokawadamun.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/tebuwozikuxipugapixegu.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/28151317326.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/11380761925.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202181854468822.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181314083115.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/76864903638.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a1033f87f332998da7974d65d0966261/suvunejunonakefi.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/xudigogovalofabuwel.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/levamixunefoloxajori.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/66289257511.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/lapamozaza.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/15054123015.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3336da8bf---22153786061.pdfIn PDF document text
    • http://billsky.ee/files/file/vizoxamepunalovux.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/9ffe1bb78317a7057e1932f80e42e2e8/17584743570.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5d4d97b2cbc620600816c8f56e6603fe/87003954217.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160829ae381970---28926547063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hydrostatic+force+experimentPDF 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_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10944 bytes
SHA-256: b626cf138e800ed52faba571623c2368e2c44ae94fdc59ebd03fcb512280a55d
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 17256 bytes
SHA-256: afe9fce30797cfd62833479d2b4ecc67f8862bd95a391e194dfc48b8be0d16ae

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