Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08b66d59874cff8…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 21:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96db20ff85cd4e7d9653958da20761e1 SHA-1: cca533327fd5b642b6a380b91eb22183a85b4273 SHA-256: e08b66d59874cff80ef2b3a6bc3c5ee4a91d745acf418595dab9245450fd7db1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://agro-vostok.ru/userfiles/file/rumufigufaxujime.pdf In PDF document text
    • http://megalabsrl.it/userfiles/files/jukawazizufad.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/jazufirudakap.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f3e2eee4ea77d104710b8dd7734eae1f/17142845957.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/doxazep.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/sizitegop.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/fapefovubofudobididoko.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcca66ecff---wizaxupevotenobomunad.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/mafulideged.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28763875327.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/nurujuxovomoreruvolanu.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/42976168878.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/29400818364.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/wesovaxibatapefipanawubuk.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/botukax.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109082345325285.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c12694ea0---sulifusigowerelumurodi.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/23993441351.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/saminikudeni.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135181a1af1b---pazesudum.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/19395032447.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/38519615007.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa670a05cd---timivora.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/7337825239.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/wunofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sexy+g+wordsPDF 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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 10300 bytes
SHA-256: 179bf9b2216059a26c1a2b62397461ba824bde0fd61df1b2b4c6ece700385f59
font_01_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 16164 bytes
SHA-256: dcdc76e8a397f683a085e46a6df0f003413a01c85eade00399896a0ee51d369d

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