Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cc74057368ba42…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 03:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79c1d48bf8fb30605065698cfe9f016e SHA-1: cc1b385eeda7cdd683ec6aba7b3f5e8ea3a17023 SHA-256: 57cc74057368ba428c93d8f936d34d08695db4f03345ee29b66a0b19f56f5ee3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting user trust through a malicious document, likely as a spearphishing attachment, to lead them to compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://augsburger-dartliga.de/uploads/file/45308929649.pdf In PDF document text
    • https://nnt52.ru/userfiles/file/46983508651.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c003ed5116c---22766085058.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/tanavuzolivagufomukakase.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/306353308.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d05ad2d56---3311513569.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/tenekivorewinatifikirodok.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/47459858094.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210814105436_g7uzvh.pdfIn PDF document text
    • http://turnyras.lt/Files/file/98219608355.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/vokitaba.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/39797356384.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/kiguxujudifofulo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/modoxapusowadimogekim.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ae680b298---satexa.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/33721806944.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a69d3cc0c42d7ee42a24e712f8b6d3dc/69214667035.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c463a6c6---duzezupovajagepif.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3323ec501a---pulomemawetukoravi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7ee02cb6ec166bd5896f79b97e6cb966/2823691756.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/125fe865e91ed7adb7f0192df160e6cc/keroperigufa.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/32851833246.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/pururikoxebudew.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/xezotutezalow.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/18433184512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=isabel+allende+livro+paula+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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 17628 bytes
SHA-256: 689a127bbdb888b45f2df4235405645232303683a794f0926cc5f7ee25dd5f71
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 10648 bytes
SHA-256: 8ab0e8b23a01e7f6ee41ab9d83c9b9fda8b59ac521b0bccea26834d60b5fc60c