Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dc64f1ad04f7a3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 07:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b86c775f9a0d52403913ee188b201390 SHA-1: e94286467bce9f1bf59f9003ed87530f6587f193 SHA-256: 74dc64f1ad04f7a3cd083716446887d869af7f5c419e6090531dadcebb577624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malicious content or engage in phishing. The presence of these links and the heuristic firings indicate an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e1edccb---59276193143.pdf In PDF document text
    • https://chiuman-hk.com/images/file/6074093227.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/pesuf.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/kewanuxakexolatanikipon.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbe7e2d42---vijopebazifufedoxaweruki.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862dea3af87---4527107882.pdfIn PDF document text
    • https://avenue102.com/uploads/file/74336327390.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f365e5ebf---5864961541.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/54714864289.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/81295824423.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/namimuj.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/worefarimo.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/pisitisazisud.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/46890556418.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb2a5e1f1a---wurupegemalivofi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747b6f64914---52734311536.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/55764965967.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8c337deb2da8d9590e6cee7c7796a464/66717583011.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/94027730002.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/98787648263.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1fe139d09baec4fe8dbaca7598cc3225/68268705107.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/s9ncd6s4huj2isq2ev1u2t10g7/puzuzebudapopixofegonaw.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ed2cb9e0e---kaxalagebokexawuvatanani.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/momepes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=solving+quadratic+and+cubic+equations+worksheetPDF 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_off0000b94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 16124 bytes
SHA-256: e9b592000e2373e455c6e629fa4a074dbca17bb005eb4b482f4963bbe2c3a208
font_01_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 11356 bytes
SHA-256: 1a0a6a9302ca96648474add0cb3a57e569bf73ad1784b1eb81cf49a95c01dd6c

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