Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df8391a184ba202…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 05:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 509388c5a978e765f84b094f6fc7c3c1 SHA-1: 64032bf3b835c3e29d2ccb34e8d4baf35205496f SHA-256: 8df8391a184ba2026b85fc058ee956426b429d32466c40040ad9bb746db11922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://adsbudget.net/userfiles/file/lananinuwub.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/50570206628.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/86311190593.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vudafaradamijomol.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d006cfa712b---jamevoxiwikozoxuwirat.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e7200c919---dowazesutopukamozosetoj.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///27786982421.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/vqjhh210n7nproe7sj0as3stsg/zivejonugugugumirevubilit.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/pulase.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1en5bjtupf8uhqdb1h2318mins/98721643317.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/16533181430.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160765147e3f93---fizinazeko.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/42522407709.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/r7jnpmmgeukm68fblk8ubibvq4/wepobivikosuxixasore.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5811410690---11017276248.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a8ece27a4761f3e9fec5c75c19bb787f/84762296651.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/katozanofelenowowito.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/rudalezapifo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607363554af3d---mekisogososerarovu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30174290064.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c719c642cb74b40b1a817cf3b2982218/68073716586.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/ledebivuragaraz.pdfIn PDF document text
    • http://kd-council.com/upfile/files/19790903211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=comply+with+lawPDF 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_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 17924 bytes
SHA-256: 08926ec17c26add85a1a1bef16c2db7417e9d3c06e3a046ada3f5967c8b622ed
font_01_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 10244 bytes
SHA-256: 80994f38f7145e76182d05a33e40675600e6e0ac9b710632e28c227a3fa458ee
font_02_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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