Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c929873d5a6856…

MALICIOUS

PDF

77.1 KB Created: 2021-08-23 13:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38ed68599e6d046677973d2d5da7a150 SHA-1: f4af1b11891c89e689d74ae557b00aa006f75ced SHA-256: 72c929873d5a6856d97ad1be4ad131366528af4ad3582ae05554fa8e4e3485d2
176 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The presence of PRC/3D content and ML classifier flagging further support its malicious nature. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53162e76e---xovonilananuna.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb736d8806---gewawelirewo.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/sojotizesavegu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/99447613560.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/japuduwi.pdfIn PDF document text
    • https://webmenuplus.com/images/file/78255589818.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d723de7c2---43290302582.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f06701b46---bezujemonolepe.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/98389411276.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d659eac5d91---kiriwixomadenowukimowas.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/95dd34bf1c5823aec148fd65cbd228c6/45218552619.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086e887771ec---81961603203.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085766ba56fc---94525995727.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/62515297620.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/3279172735.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160729c6fc7b19---rujibosuxexuzudurilu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/239172bf2c6710dce0de7c8ea806f8da/buxeriwesuvifuledodal.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/dosurigewejoruloliv.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/77291255916.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/damaz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8233c22a0---87531597237.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f05611ab5---meneruvazegukimiwik.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ee0ec90603691e9bab60498472b2af35/fisatisanaverutefapotige.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///57365758673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=corrosion+resistance+tables+philip+schweitzer+pdfPDF 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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 17052 bytes
SHA-256: 57ab483e856b614747234374620090c62c15d9f82c131413e5e0a85969575d70
font_02_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 11036 bytes
SHA-256: fa824f47cb6d693bf5ec2d7f9093bc26e34e876a88be41b63f660fc8d0e5c2a5

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