Malicious PDF — malware analysis report

Static analysis result for SHA-256 190635ed2e9afbc2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 11:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33ce7e951e67f5e9d544c284c460d6ea SHA-1: 1c9366c8e33209feb47e26b9b261e6cb9054dd94 SHA-256: 190635ed2e9afbc244562c83971c98ef44a00c8224da3d104ee18d1d0b64aa13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b54ec1a1---82860695836.pdf In PDF document text
    • https://audreyheselmans.com/_files/file/xevideluxisaxiri.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073874e7fdcc---kilakivoditevoxulisalomib.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/tagorasegunesogonolafe.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/bodirixenuxakofavip.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3637669ffe---vodugefivobozoremubebosa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608791cd5a6da---punuduludawatagitupefemiw.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/43787123591.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/krobhububf9frkesdrugqtjc17/87923581430.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bbdce9aa9736a69a608766bfbfa03216/wugaboj.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613668fe4c0e9---luresanek.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4cc6b487b---29099122417.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/lapotizoxibafenowewuz.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/15458902821.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tmf5mlepdbl1u3ed0vv6eppnf4/62204139686.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/vodevewenemo.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/21188635722.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94aeed707---32068845011.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/22990548073.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4de06df55---13767592747.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/de33b6ffb48862aacf88809788b3d005/63183930003.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7309fd08---zusopupuwibebulig.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d8f561ec09c9787e89ef600c8146c84f/84620930295.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161152b41bbf3e---91474126569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=piper+twin+comanche+manualPDF 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_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 10656 bytes
SHA-256: 679baba0dc4d76f2ae35f98a1e214240bff031eeb769b192bf53e4e7f56cff6c
font_02_sfnt_off00011aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 18660 bytes
SHA-256: aa54bd3ef3230e8217e9adb32c3c63d4055f7a0aff73fca67459a79fb289f6fa