Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1110b40a920e2e…

MALICIOUS

PDF

78.8 KB Created: 2021-08-21 20:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a08975b3d9c3f3ca206ad0b10fdc3872 SHA-1: 0e928f6d486ca9e201d1addcef2cbe9b9991bff6 SHA-256: 7a1110b40a920e2e8090c01840472a621b07464679cad50b3b1d77f2c375a999
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cafehinglung.com/uploads/files/93067136291.pdf In PDF document text
    • https://grup-insaat.com/userfiles/file/kedenonedivimewubaron.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/keferarat.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/6bad8944595681e212ca6667bbda6270/42101092268.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/lapekegupidaseg.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/71304089998.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/fixorozozekepojuza.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/xaxok.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741812e6b60---vojakezupazovolof.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb2ba57a9---pozubarogukolabepom.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/xelowirotuvirarajob.pdfIn PDF document text
    • http://com123.vn/uploads/file/32861373976.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0e22eb9235a06b323788ecbb39ee30c7/21137326057.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e676c75fb71---ruxozufagolugadanurilot.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/99059397880.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/ribonogawulakax.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/adac8af4a6b715abe92ccbc1057859d1/jasunosenalasojuriturodi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160969f6926cad---38994763283.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/45735558708.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/takugusitozewapawek.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0bcacbd9b---tutulivolobefun.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6a40c7ade2b9068e7113355d517f2fd2/fezudusulit.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bosewuzajemoxopuniwedo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b508f133751---togafebuzodikitibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=b%C3%B6lme+b%C3%B6l%C3%BCnebilme+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular+ve+%C3%A7%C3%B6z%C3%BCmleriPDF 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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 18096 bytes
SHA-256: e2681dabde78e394717eded6e762aaad2d6a82d877731cbb6916b96450367b76
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 11576 bytes
SHA-256: d696c9bf9976033ec3bd783a848da561b1a404652af5e0594c6de3a2ebabcaa9
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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