Malicious PDF — malware analysis report

Static analysis result for SHA-256 89da8a10611dc721…

MALICIOUS

PDF

84.9 KB Created: 2021-08-22 00:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6f3c635ad7aafc754981467723d33e4 SHA-1: 11dfbd6327511c5eb026074b3d4188ec60778393 SHA-256: 89da8a10611dc7211a4d97333e0e2c07d088087d84171a28c6cf74ad81231252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and numerous external URIs are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://coretry.ru/uplcv?utm_term=motu+patlu+ka+cartoon+dikhaiye+video+ke+sath PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcdbf2ce93---41357038757.pdfIn PDF document text
    • https://rajakedua.com/contents//files/31271141232.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/88919943648.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/visovefafafarap.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/11529255509.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/98961629293.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160af73adcc4bd---7462008401.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/64627390679.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c74dc9d185a---ruwatugurojapilarogo.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/wapuzonunalibox.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d83575610601b1a7540e5ea96769921c/vixamut.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/99204828313.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c6be808df148678acd080ba2b649d034/fitewitonaf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0701638443.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/51460383898.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/2339536951.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e83e4cb912c52b5ab71e38d2318b07d/jofemexedujar.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794131e8b11---kuwogaza.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/ruzovesokujumuv.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/51918612807.pdfIn PDF document text
    • https://anfauglir.com/images/file/rewijukadefakodovebepos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 17292 bytes
SHA-256: 941ca9b3c1dbe011806c0f57a5bf82d80aa4ace20923315abaca54f3a08fce08
font_01_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 10976 bytes
SHA-256: 94ecd79f09763e7512808e3589d95d9177946b3ca2bcf1ec00dcaedb55c6877c
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24

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