Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce184663a4424eae…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 23:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38c7d7ba4fc0862406aab2f199d6de50 SHA-1: 6a1ecd4e6dcde77cbac56319bf34834ca0fb2524 SHA-256: ce184663a4424eae0e87a0de72f64ece9532222f2aa4d17a9fafa8a466d6aa44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The heuristics suggest the document's primary purpose is to act as a lure, directing users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=influencer+marketing+2020+pdf PDF link annotation
    • https://adminico.nl/userfiles/file/saretokusugasaj.pdfIn PDF document text
    • https://ptogel2.com/contents//files/88091795162.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/ganejoboborarefitotalix.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/qmjfcqsgupa968arg8vhdoun7h/95200822276.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/zikuwifurejiwejanapevi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/91865418790.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26a52f0f4f---simanawujisimefewavu.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/3442795075.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e07fcbf---gufomikuz.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4bd3e639144e20f7802a477034ba6f32/vosalosogujofiwebuman.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/zadegasobewelajawaved.pdfIn PDF document text
    • http://hibertek.com/image/files/20210817_164236.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/32625363029.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/11824957253.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/167832965560f7f3c7772e5.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/kajizomimabixolomema.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ttr7q320plealeo4g4a0t9p9ef/sarirade.pdfIn PDF document text
    • http://cocoal.com/uploads/file/mibediwar.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505155902448730.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/sevad.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/50659137262.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/nivojuradizebiwejoximejiw.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_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 20820 bytes
SHA-256: a5cba0eeb18d753213aa46b158636ddb01c497eba9130ccfda64bbf706c9e994
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 11060 bytes
SHA-256: 1a9b8c123749a7b330889f2e9b015dfa2a8ddfa50caeb4c40a85f79f9652dec4
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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