Malicious PDF — malware analysis report

Static analysis result for SHA-256 674681bdc6037481…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 21:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 631c02dc1afae9fa2510ce02b7846785 SHA-1: ac719c33dd68865663694a8b703bddd0d6ab30bf SHA-256: 674681bdc6037481535287044b6723489c367e325c57d9d59fb16033bada8d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of these links and the overall structure indicate an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=pengertian+sel+worksheet+adalah PDF link annotation
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/u0ck727gs646fcjp5afg96pa95/zajifula.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/redowugowudigazav.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/97495823296.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/52664711745.pdfIn PDF document text
    • http://teakdeck.pl/files/file/kuxumivisufekubezepijar.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160828e6395740---nodijozaxuboja.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1f581dbb---10054008939.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/32178919138.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/89994250336.pdfIn PDF document text
    • https://icbacademy.com/upload/files/bijosiwirejefitegalave.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac021771f31---65794445564.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5258216e4---61800550553.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/tidaw.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbab5a4cc12---26844981791.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/barizarasukojupi.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/panopaxidogomivisiwusi.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/7927065058.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vofufo.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/29374516564.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac9283dab---63073056905.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/mojeneles.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad4dddbfcc---97788763490.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac2c654bc---kakimixezal.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/veburowu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/gebuxenulij.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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 10704 bytes
SHA-256: 5c804d9b234d45f6554976b0a3d4fd5e8ab676886ae5f2141ccc94a8d8d4c430
font_01_sfnt_off0000f621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 17356 bytes
SHA-256: 9f5ef14890eb0448dccc2b12322b9f750554c635c3b88d1b45c3349a3585a53f

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