Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd59af0fa8f59cb3…

MALICIOUS

PDF

117.1 KB Created: 2021-09-06 12:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 78df12856a0d02c31e90c8745a498ce0 SHA-1: d84985ca9a4adfff95547f4d4f080f595c8718f9 SHA-256: cd59af0fa8f59cb3073320a46fcb433b04a8dfd36daa2722d577e06ba87206d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://liyangah.com/Upload/file/57462517157.pdf In PDF document text
    • https://datatech-int.com/userfiles/file/801021151.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/72928364025.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e766d03e9a6295082a055827f34a8d4d/texozenujibotusuza.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d8ea87df9a4eccef7d0fd2a6728ab8c9/57216037054.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tubezeduwudoxilapiji.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tiladusavejazura.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/88976584135.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/2913023643.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b222fb841f---75024656762.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557dca2e94---mevogodinoniniwexasijufe.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc21cf2d3c8---ruderawifezowuzatavevemu.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/tufovejobizokuli.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/lofukekamekogu.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ff945e5b5---24953401206.pdfIn PDF document text
    • http://rapet.hu/files/97441669341.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/4ucog23ojfq39bv2p8qs7lp3hm/fijinegudepakulonul.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/68375237713.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/da9ceee73e447037f5c1374c7a2ffebc/34254389020.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d2538a09f6a25c5028daf75f7ddbcae5/91796100308.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/gitiruxiratufesevasewad.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/rapaduxutoxavoromokewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=netgear+n300+model+c3000+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C9 24692 bytes
SHA-256: 43273c69abcdb8a59da226acde955abb999b0eeaa61a93b99905d492babe8c63
font_01_sfnt_off0001809f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1809F 16168 bytes
SHA-256: 50601d38bbfb31df5a1b3982eb0fe59d20de9ab40e473d01bb43e96a7897edd2
font_02_sfnt_off0001963b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1963B 10824 bytes
SHA-256: 043f2690ad4c80477e22859fb7d08d6340af3f7d48249527ed03bfc82dba304b
font_03_sfnt_off0001af08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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