Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98e871006fc0d3c…

MALICIOUS

PDF

80.9 KB Created: 2021-07-15 23:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a148bde15f6e089fb908d40b9a4dce56 SHA-1: b59e770688c6819a28c320d16e693e214c10e509 SHA-256: d98e871006fc0d3c535fed30dea15121bdd15757cba8b9464e4c1aeb269ac75f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and a trojan. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards the PDF serving as a delivery mechanism for malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=pdf+page+remover+online PDF link annotation
    • http://chiesamadremarsala.eu/userfiles/files/ladevejudupix.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f7e51fd29---xatozemi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160743623a2d40---zaduvizesedoxawenowenasi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080161376801---75669523556.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/68786342774.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ts9vvip7hfktc7gvgg7dt12s74/pevezevuwovuwev.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a618cf793ec---11188576520.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce87eadc6f---vikupewo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091dbddc2711---davafozatovat.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8c1e9ace---xibinasubeluzid.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a2e8b65003b1f62935a4552239663c2c/jibutepiwabegitopinavom.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8c0be684---48445771702.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/53541610897.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ad301346de04511d86ea50621cb2e9d4/jogokopifozunujab.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/83519020220.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/920d39e31f6a005a020373d3940ecfa2/83040483875.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/jalapuloselaberanivalu.pdfIn PDF document text
    • https://filetorme.com/upload/files/fularomipepuporikaw.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b56127eebf64be20f3eb9289c762dbf0/3014243782.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6ff68787---57289891299.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160873611e34ae---lorajixasugew.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i2ib01t4eodioore0shl00qtp/67973204220.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/31856830890.pdfIn PDF document text
    • 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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 10644 bytes
SHA-256: b57946b5559f5b333c3e7b664979a49265bed9b480e2f1b9e7d548e674053ef0
font_01_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 26284 bytes
SHA-256: 8d12da9913867586769e73e35b3db8f76882d665c63c66b90b0eb690511c0035

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