Malicious PDF — malware analysis report

Static analysis result for SHA-256 d938e0150b4ab73c…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 17:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17ac4d0972ddb39a1acb0916e8c2a956 SHA-1: b3d73a376201dbe4c2db178923f152f78f50da9c SHA-256: d938e0150b4ab73c6e9d05ae764aef1fcd03fbaed876b4596f5a43ec591b1857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. This structure suggests a link farm designed to obscure the ultimate destination, likely for phishing or distributing further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab792bd172---mezebebawanemezaba.pdf In PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/55525138613.pdfIn PDF document text
    • http://htwy.com/upload/file/mudusaxulujideralotipexug.pdfIn PDF document text
    • http://screen.by/images/file/96674213529.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/kugusatogejiw.pdfIn PDF document text
    • http://myesen.life/userfiles/file/segirozidiradez.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160996edb58170---tobofuwiwulokivibozi.pdfIn PDF document text
    • http://tencanpowder.com/d/files/xexiwovebuvonotaxenivogek.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160af451de8983---fiborenixuwegivukopi.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/43118259868.pdfIn PDF document text
    • http://texmet.pl/userimages/file/tidimazajuvesomaxub.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78933188473fe71d901f2b92d3da61d0/renixu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210623_FED4103E1169AA17.pdfIn PDF document text
    • https://orangerun.re/photo/files/73787282219.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/zakalod.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210809_378368464B5030C1.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8531524ab3---34835310459.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/zadupoxo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095df3edce11---dijidawapojijaranukel.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609124ce3299b---21714285298.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/litojedikax.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/xusubonapaborikelojab.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/119ea0a4ea0dbd920fdc4301c1b1ff2d/mapukamavixevanatow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hebraica+stuttgartensia+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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10860 bytes
SHA-256: 5ba4d975a8d13a394ee6e5787a677b37faa0d70064b289d143d17faad07b457a
font_01_sfnt_off00010133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10133 20128 bytes
SHA-256: 700a18870357ace320bc4570fde406924e02c6e7ea163cd9aa5ab8747f222e48
font_02_sfnt_off00013680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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