Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff306fd05201b5d…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 21:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a003be9700a77f1219000b63aeb8e302 SHA-1: b7075a014827c7fd45ad86d66d4dbc547f6d8bc8 SHA-256: fff306fd05201b5d52cd874941f15f5fa1603fdf4faf0bddf384037a8808c0e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. No scripts were extracted, but the presence of many external links indicates a redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=meaning+of+catch+in+english PDF link annotation
    • https://vishalahospitality.com/ckfinder/userfiles/files/xiliwiwililajajogaxid.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4kjg3c3qdmc9mthdcom46is6b3/30109955298.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/84613586045.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ba1e76d2147f16a242ebdec41d6a3e2b/fegogubom.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4f3d63512daa73fae4133a4dfd4729b4/zoforewukuwifekalifi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f0f287d13---94398446496.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/79a00a542743b581b9b2bd0d87b18966/91547672464.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d96e71466---witijeperelumafumiw.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0a601de9cb519a8cdf3bc5bf7bcbf21b/sifabunoritutivumarefulad.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/g5hfqpvicq48du97e8tj1o52vr/remivizakagiguxuzinanan.pdfIn PDF document text
    • http://apsons.eu/files/file/rodewelejum.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c454a23de6f---91979200459.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/fftj676su06so4nbsvm7e7i4sm/xefixotezedobilupesinus.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/70386d977786c8177534d960f0ecfc53/23053746757.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc5d17b2d7---difuwajuluvoruvan.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/ddd69023a0a0a8ba91aee214ac49b34a/vuwiwizedopetubebek.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16078017d8b7a4---videreselalofumepamof.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5916578512eb8d0fb3e3f92c79f68cfe/sefibakimidonuporur.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/sobupixed.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608663f209531---donajejibijolat.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/84717671361.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hvcqfpg9pieh33to6ge93eik53/dozududewawinimod.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wajukupakigazazilabara.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/27445328702.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_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10508 bytes
SHA-256: 6d1faf78d71af33ecc63ac44aeb14cf5ac09389aa5a11e51d833c3f8ca7e3c9d
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 18732 bytes
SHA-256: b05915ec42fd69d31055b67b9bc78b0460806930ba72a4f9ed902b0e3a1722fd
font_02_sfnt_off00014e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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