Malicious PDF — malware analysis report

Static analysis result for SHA-256 77741726637e1137…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 10:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99b500bba6ca6475e5b5fb742e165e4a SHA-1: 898aa962701f5681c579b8f5d6a1def51421d0cf SHA-256: 77741726637e11374451edb214f6beeba7a40659be5f0167a0a2b903647bf2b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=rick+riordan+demigods+and+magicians+pdf PDF link annotation
    • https://butterfly-propertymanagement.com/userfiles/file/58413677079.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e2f45b010---76276286506.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/74920478819.pdfIn PDF document text
    • http://hkwwta.org/userfiles/mipetonojolazivute.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vaxebefufafubexalamiviko.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac194269c---99894540111.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/pogukorotepu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v8mp23lr39vjaq9emv8jboflj7/83902193948.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/78636039528.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/supiroriwidugupazinoveb.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/baxubozeduxeguxofekojive.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/fujozib.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021082520540344.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e7699802---kumenobovarepovopuj.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/735d5c05f84400fc5e18ccb0eaa87e16/26165328283.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/27974119058.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6c7ab7f79e90694d8e1e30beb68a271c/totigejobe.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/bizarifidavotipimajuj.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/58691356658.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6428ilq1ianv5o058l38g5e1h7/xuramipoxi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/likexuvasugedetadeg.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/ritupabumuzesapuweref.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/im41pqm323skqf0ki9sgqt5qde/palukekamepari.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/11601030777.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7A 15656 bytes
SHA-256: 9078ed62992d31afd67fdc914b509923a9ab4f767bb4877e82cf4ce0364df85b
font_01_sfnt_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10956 bytes
SHA-256: a0e85f478cea04b27ad2ece8302ea0d6f11d34bf3e72ba5c419d55d7a835e3d1