Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7891658ffafc8e0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 15:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d7f2275b2682a70fc90be55a761bd06 SHA-1: 1f195b9aa7c12f9cc971d4d8ad5e2df51c3babdf SHA-256: b7891658ffafc8e005f0ec4c47b04025c277b921e10355ff4ae7eb6c87a0aa10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and the link farm structure points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614418fccbf8f---vizitudunuvefiginajawuw.pdf In PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/16945739081.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/movakavofutefewa.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614679a2d64aa---lofoto.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/82386623750.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/69065824514.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/gajozufajegopaf.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109131754342539.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d4ddae90768d332feb5aaff0989b649e/farelin.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/95772476089.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zogafanejojode.pdfIn PDF document text
    • http://synphabase.ch/upload/file/29184695013.pdfIn PDF document text
    • https://educhina.mn/editor/files/bevapedafar.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/80018548989.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116283d1e4---46434329584.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/78283150570.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/49826627375.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c72aec000---69151274787.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/92742356080.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/64769764873.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6c4df74f---15351914936.pdfIn PDF document text
    • https://questyme.com/userfiles/file/82573590915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=nonmetals+metals+and+metalloids+periodic+tablePDF 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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 10792 bytes
SHA-256: fbd36afa636c0510abff7df1766aa7dfd4278299ce9ad8d71743fea1fe5c149f
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 18364 bytes
SHA-256: 54bfb67300ae2e649f1e524a5ac487952ed7c3f7c2a16f090547e23275feed20

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