Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a965d895043b87…

MALICIOUS

PDF

86.1 KB Created: 2021-09-23 03:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3edc8e9ab01df1066e6cd6d08f1979d SHA-1: e3cfb48f23d64bef33bdd289f86cc08a92e6fd3b SHA-256: d7a965d895043b87d0e63cffbca1ce7c579e9984b0911de0b26ef70b43485911
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=how+to+send+text+to+multiple+contacts+on+android PDF link annotation
    • http://hamzalegalservices.com/userfiles/file/9633571557.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/3572217766.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/bevodesidoj.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c7dd09b7.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/pugaxopazanuv.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/genobiwojisivifutadi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/sixaw.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/31d48f426ea129c0834286d982045e2e/69173046872.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/jazufegowepasekamo.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5180465d4---pobugobixipo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614317e9f074a---batalivizonemukifokureba.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bafc6b9bc---tomenoxoko.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/vonakimedafamijom.pdfIn PDF document text
    • http://egitara.com/upfiles/files/jisudubibapeganiv.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/bubaluzulirevirarukofi.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/86653496527.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/33ac4fbee07ce95719cd2bf175687a06/31963181692.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/7251407676.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/bojegubaxago.pdfIn PDF document text
    • http://biomehl.com/images/content/files/49260712082.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/89328406345.pdfIn PDF document text
    • https://premium-house.uz/images/file/52087508258.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/rulij.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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 18472 bytes
SHA-256: d5a0cc6e21c4782ee5daf46c65aea978374f231454e2501097df8e79541e5b96
font_01_sfnt_off00011935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 10952 bytes
SHA-256: 6440ce8bdcf3587a5a20904170ab6eda7555dc76ae12817f8740029a68a7c0ea
font_02_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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