Malicious PDF — malware analysis report

Static analysis result for SHA-256 296bcffe94a7d8c2…

MALICIOUS

PDF

85.3 KB Created: 2021-07-30 04:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6f430de64e26eadfd1981e2a6cb1d2ea SHA-1: 940df2e0fe44b940bfbc31ade99cc14ccaced4ae SHA-256: 296bcffe94a7d8c25924a530e05a6b92d60c6905d0adddf47d583020baaa9d4c
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/36824410617.pdf In PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wuliwi.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/55887450638.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/494c521e1e9cc9aa82f3e557af60e7c1/9476643475.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/tumijutagotanogaboko.pdfIn PDF document text
    • http://www.asslar.de/downloads/xepufigamuwanasugiketub.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c24b14bcf---vovemaxed.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a6da5f9b---28691544112.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/lekexedanuxo.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/94488346780.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/5078237159.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/lematoxera.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac1204cda---riwidajuw.pdfIn PDF document text
    • https://ivaco.it/file/rojowezabizawilobiwaxam.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/23925691899.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/97122011478.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/24f4a55831b9843f8d80bacfd899aaf6/52296638619.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/wuveponu.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/53867210403.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/33080925236.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/libilizikexamogevew.pdfIn PDF document text
    • https://ikansambel.com/contents//files/84335138323.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/benuvavudawemeguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=icloud+unlock+deluxe+free+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_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 10444 bytes
SHA-256: b460557e58ea7e605c48c537aa961ebd2e5f712b3a35711c27b03b63ccb1211d
font_01_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 17140 bytes
SHA-256: b1005a32172ef06ade1d51370219b97be51c7d93445c91d567b52a2791cd0c0b
font_02_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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