Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b439c3e3607a8d…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08f01750c11566618452607755704b04 SHA-1: 140a62007a5ff40467f0846a0b383eb4a6449432 SHA-256: 78b439c3e3607a8de0313f0a589bf477fd95cbdbc2d8085d84abf4fa1647fecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic findings suggest the document is designed to redirect users to potentially malicious content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v6m6vv3q5oa9db22881s88picn/reromewenilokuxipapubazoz.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4a60c0764---67900080602.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/43777834702ba108d8ea0f2acd327de7/54643253194.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da17e765ec8---46732569599.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/22172065073.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc96639cd59---kewut.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/sefexigu.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/78845411193.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/80814657299.pdfIn PDF document text
    • http://jucal.es/images/file/63337442308.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6422e31223---73735580636.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/29240356445.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/nipuvenapozoti.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fimonawazamuvavirud.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adebc0ce697---ruwetupukajaditideluf.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c27gj2vcqes48pk4h836rorrn6/palirojusejonawotujivo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b0c16941---38732624719.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2d30884eac765be6549a355aa0dd8edb/zobuwafura.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161035c1f3734c---52235101277.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/153c5efab0cf3c27ffcf4ab1667e8c3c/39836245527.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/53175154416.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/69332878323.pdfIn PDF document text
    • http://didopack.com/files/nemuforelovipavun.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/gapamulefazegebenipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=convert+jpg+to+pdf+under+300kbPDF 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_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 11056 bytes
SHA-256: 4e6268ba927d289d165d4e70c86a69c0f2fe4308e689e26d928786b0818ee213
font_02_sfnt_off00012952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12952 19068 bytes
SHA-256: fb217696e84168be690da9f66bf555744c5cf9ddc2b97bc833c71df322be4308

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