Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84458aa71c2ffd1…

MALICIOUS

PDF

85.9 KB Created: 2021-08-23 12:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ddd340c77e126a4c59cd7c9c1b316fd SHA-1: 69ce79cfac85dc70bf14d5a67105ff31ce174c54 SHA-256: e84458aa71c2ffd1b1e39c92d761f373cdfc0f5fd61750f4dcfe7df8ef23965b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ajivikafinance.com/userfiles/file/99827192557.pdf In PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/98ff08fa56f675f66d726a6180eefa1e/jofaviwuxowujefupeziran.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161197fd088c19---55090146568.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210708065219.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210614023001_2wpsnf.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wezexojukoforo.pdfIn PDF document text
    • https://vieclamkythuat123.com/upload/files/pafuzuperuditawoweresu.pdfIn PDF document text
    • http://vipdiler.ru/files/file/92674854434.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b4cc4fa46435f95c858fa8780273adb8/39401203030.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6262a7771---sefolowo.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8559fa82f42048622b31caec270b910/relifunumewomapaxegemuje.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/90f7c83bed1bd38324cd0111b1d2c435/97119474290.pdfIn PDF document text
    • http://air-ned.com/uploads/files/selukubikokutagok.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/pusasozeripasu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee77b65544c9570f3b27496067c2c070/busoxufezetilo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1261cbca487d35ae510011298eb6f0ab/vesuvofu.pdfIn PDF document text
    • https://p87.hu/files/pivulidupabubi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dd62f922---viporadelotipenazanu.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/4789696242.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c327556628b---genogijoxivudafajuzuze.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/357e6cb0ef92b83685c835ffeb641687/56354574590.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/sezeruwirazededudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=codes+for+speed+run+4PDF 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_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10300 bytes
SHA-256: c179ab771b2652ff4ac67e68c3095e3189449d6ef9105a624912e1fe097b2ac0
font_01_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 17048 bytes
SHA-256: aade17242753d09bb717585f6131b3535a0ca72810db40f69818f1556eeb7e8f

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