Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce7d49146f42ebd…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 13:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f2d57a0b2909627aeb28ba2836fcb36 SHA-1: c0b8a4ce162b7eb352bcf343e5a22b051ef96aac SHA-256: 1ce7d49146f42ebd064fb20e135dc59190d3d20d5528d287da46a3a417e31b91
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5de70f98e2ec5f07eb439dae446e955d/doseragajepegodo.pdf In PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/jojilugatot.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/sixobasowudugigafo.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/89314199453.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/pipedisewasafilenidef.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f321607846---tibozitenigerinikidobafo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/40796400340.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904035716.pdfIn PDF document text
    • http://olympusflights.com/files/files/fojimenuredoseter.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/44601090839.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/radagasaseku.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/pawobifuvuwudabozabox.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/78909458776.pdfIn PDF document text
    • http://altinay-law.com/images/file/busofuluje.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/jemuzugemonu.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/dopetodawajemuwefe.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9692ef05---49088219397.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/77820668834.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/072ad39e202952ee3efcad3ae8f77f5d/litatapemav.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca095a0bf---91806325773.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/80891413889.pdfIn PDF document text
    • https://norservis.cz/files/files/16055010321.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/poxasagadop.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/jebumiwunumegigit.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/nafab.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/mewisodu.pdfIn PDF document text
    • http://tabletopad.com/images/file/sosagupotisez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+1.17+apk+cave+update+downloadPDF 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_off0000c048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 10952 bytes
SHA-256: a33dced82927a5ce528466f84e36aa3610ce95fe9bf951d710015e4b3050a2f9
font_02_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16756 bytes
SHA-256: 13aad500f281301e1ecf599a2563ec1d69ff2d7efb70efc387b5143f10fd4530