Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f8de3a67965e85…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 06:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed1d5c64dec2b024a7f93c86565c104d SHA-1: 79bb9581c47727e7e6e54c8314c26cff1f19ef0b SHA-256: 51f8de3a67965e85ec16cee5a06b6cd8cc7a561b3772903624df8f5ef86d39d3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, directing users to various URLs hosted on potentially compromised websites, which is a common tactic for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://myphamhelios.vn/luutru/files/fanuta.pdf In PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/13499781467.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce9edc6f16---giniserixevinijexafivad.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/wewalivibujemawapeki.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8beea3ad7359b6d39808175d31fcc933/21089699383.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/wamudobo.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/67161905854.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b099ddc8467---jikarilagumawexosinozigi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/jobam.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100de3d8ac0f---61430656245.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1dd27cd44---21838159941.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0720cdca---zapadanumina.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/girimaratigudota.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/93023130149.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610db514edf1f---64182715683.pdfIn PDF document text
    • http://vodnik48.ru/content/file/33503499235.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5pcfnugadlrth9uk0knkjorr67/monedibaxuretuketok.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a03bd8426---38430375872.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/radulutudubuke.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16106bd3e3303e---16932226472.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9f2077f2c---dibok.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf168c3d151---10594219958.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/xulubadalowaxewalegig.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/74184673935.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/55748168957.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/notopusofobefemokopixud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=me2037+maintenance+engineering+lecture+notes+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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 11520 bytes
SHA-256: 3fcd059576478f2c1b018a7571aac68d80f78ac7506b5992b418389a1781bd4a
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 17268 bytes
SHA-256: d97c221b9933ac75ac272f0ada96b3b1f24e6a680765d1d4882a05bcf33669bd
font_02_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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