Malicious PDF — malware analysis report

Static analysis result for SHA-256 65eef86d9dfd89e1…

MALICIOUS

PDF

83.7 KB Created: 2021-07-21 07:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d64dcfc9e8f139d9dcca1843c4adb64 SHA-1: 93f7de403b2c02d3af39123c4fb4ea07d44f20a2 SHA-256: 65eef86d9dfd89e15526e98cb9451549bd651ff328131cf0e0c2b665b965ea1b
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. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to distribute further malware or engage in phishing. The presence of external URIs and the overall structure suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://werkkledingverkoop.nl/images/docman/files/82746889884.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75bc5523c---69480525975.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nejozizewega.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/82qvt6ee1j3olboce4n95he0e1/83309639093.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/33426005757.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f20f9a0867cf7aceb58e10931b4e1093/44151258394.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/84754e3f960da8ceb823529c4e982e1a/30840402288.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609480083d888---44207780072.pdfIn PDF document text
    • http://614move.com/clients/4890/File/serinekigezejoz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aecedb28a---mujenoligizofer.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/45782705162.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf0bdb8b6---23984174554.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/91017564107.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/92072488341.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160831956b1377---pikidebe.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/joxitepukibu.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608894aa4cb69---rarad.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ccd942c89---vosanenugusujejof.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d9acfdd5716fb3a44bca17e8b1c07b3/wuvewi.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gs3glls9eo4q5cm6ttqhirn9ci/79560301041.pdfIn PDF document text
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/59550217020.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10a79d504---458916120.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/88181839448.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/walinetoke.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/zatudefebidugavunapenix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hodgkin%27s+lymphoma+stage+2a+survival+ratePDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 11356 bytes
SHA-256: 685925ed8ebce1e8b9f2916035d93cd76abe566a6232e76a3e7b70a3b5278274
font_01_sfnt_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 16808 bytes
SHA-256: e94f7e2cb533eaf37da7e3f21560e41977abf0f96997702a3d02a8ef5b97c8a6
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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