Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3ec0b9dd85af59…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 04:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7df97f5917b8f55b4048eeaa6793bd61 SHA-1: 29f9e75933eeedede9ddc8d3b634c7d4b7ee5e77 SHA-256: 9c3ec0b9dd85af594f9fd787565fd8be944ed1604f1acfe4121e758b6ccc0f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=yify+movies+unblocked PDF link annotation
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2cb7b53ee5461decbe03b003d93c7b4b/bowamopibi.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/97674998838.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/27988600377.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21986ab9a---lolukizipefo.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/56381139041.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/relukap.pdfIn PDF document text
    • http://haai.org/upload/file/sudox.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/pimurivebonomizeludibapa.pdfIn PDF document text
    • http://allier-genealogie.org/File:/73535837397.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/xokobiluzebasatobaso.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/26836351856.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/96377522217.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/89157326443.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v27pouor7cpg5cf21q8sc5l7u1/xokajenurojukano.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/32e1fbaf6287778ee109745383c6bae5/97294886014.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/56227569971.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/69012629945.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/bititujakodorifakidalome.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090111120532.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/tiwufugina.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/4175773838.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/94748616920.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/sexodemimeziduna.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/45532348464.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/xomiwazuwezaw.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_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 10772 bytes
SHA-256: 1afacf55d674e8f2fa925c10f0470e08fc2c125ad45dcfde8181e93e0dded140
font_01_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 16448 bytes
SHA-256: 869a1f37831e06e8fdc541f628e07f060e35e20ae7ab7dbacdc4d5c0f2ad31d4
font_02_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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