Malicious PDF — malware analysis report

Static analysis result for SHA-256 e868755024f77f3e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 08:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ed2c336dc14ad8e324276b2493de277 SHA-1: fb1824f58f8d2b25002eb6afcb45d3622227763a SHA-256: e868755024f77f3e86b91f6855ca0559b2bdfcedb60d49725765cba1acbf9c04
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The PDF's structure and the nature of the embedded links suggest it's designed to lure users into clicking through to potentially harmful destinations.

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9c8ef233---gopazaga.pdf In PDF document text
    • http://tomasmrazek.cz/userfiles/file/29633587966.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe175cea72---64130285207.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/94846337192.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075621006b0e---galot.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890528c6a78---bawobezigalumipo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/82buvsgp59go51l4tarr59irg0/jivujodotininipisoxijega.pdfIn PDF document text
    • http://idroter.org/userfiles/files/todidozeded.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609296c0c7c66---kejutotujefotejodegifesuw.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/tuvetewegiwijavubenanewa.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/285f72fcc3dc6b1070c7e64f80d67f8f/tijukojewuvugaxini.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/duzevapexovofofukuran.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095aedaea784---reregejadazixuka.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jo41rn6nhrt32qedgp40qtac10/36597112109.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d386e6c5---puvuvovedapixek.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/desinurowabanexuloro.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2e92adcf---9773171663.pdfIn PDF document text
    • https://tpk-m.ru/files/file/26824565112.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/motunizofimomo.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051022144996.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/nuwimotofegereropovine.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cf7068e98---70041617044.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/70876281211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=antonella+marty+pdfPDF 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 10492 bytes
SHA-256: 270305db7ebb294ccd5adc47f53528f1f14b0749dc07d9e30251ca4a827d3741
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 19044 bytes
SHA-256: bad7496757a5b27f013bced071be5f993797322a6f38d988213b55271ae0f1d8
font_02_sfnt_off00013304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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