Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd241bf3caf31198…

MALICIOUS

PDF

91.5 KB Created: 2021-08-12 07:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f9aa0742e17c36e5968ca53faacff00 SHA-1: 05a3ae2fd87095bd1d6fc833eeccf11eefbe2bd5 SHA-256: fd241bf3caf311987e9a08cb9452eb948926a7389b2e2d2fc8c89c3f1086b119
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised WordPress sites or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=descargar+libro+dieta+keto+pdf+gratis PDF link annotation
    • http://location-appartement-venise.com/italie_documents/files/78569680940.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/31168084668.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/popuvuja.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d736b302---66611256433.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lipike.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c864732bf88---fotirarukas.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07c5dd3be6---jetunutu.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/4874738728.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/1692583611.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608273f8dcafd---82105871320.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161116e2ca6db2---3583681573.pdfIn PDF document text
    • https://purefeeling8.com/data/file/zaxekokagutokapukopafofek.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/tomuzor.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a597cce51da---mukekiwunevotudivuvu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/14abaf373ba47abd0d2ffacfb22aa54d/xofijinepekove.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071341b6404f---82523266082.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gd6eeo4610lmjgkifurcmi2br4/98020885505.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a300dcaf276---92365095065.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/7281872733.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4fde54cf1---xakiwogozibavisorig.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/dedeve.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd17302368---83249673839.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/46uh5m7855oai9g584673bf6k6/figege.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/bac85554041f7453d4695545227f412d/jurelupenewatevi.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/52721486062.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/sajivopimij.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_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 18372 bytes
SHA-256: 4feae6750676822750f7f5898309416ee1de5b54cb9ec323e3f0e7b8283c3362
font_01_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B1 10924 bytes
SHA-256: 640aa256037c87e3bd4c1ac912170198f762335fdacf4decaf06df302afac991