Malicious PDF — malware analysis report

Static analysis result for SHA-256 24960eb8ff69bdaf…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 05:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 599d5115708834979df1df31f8e7b23d SHA-1: c5d0f491886b12354e369dd1c98e270821d7c19e SHA-256: 24960eb8ff69bdafd113d185ec9a7ffde8bdda0e6bdfb271af26c5b3551e245b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hockjoohin.com/admin/uploads/file/79435792276.pdf In PDF document text
    • http://aolisenjiancai.com/data/files/55875998203.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/72463045040.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/musisimefipesukobaj.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613151d88946a---dijajebitos.pdfIn PDF document text
    • https://irantruck.ir/data/file/92627644552.pdfIn PDF document text
    • http://esistore.de/userfiles/file/kawolatiguxuvunuzadup.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/48466863581.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/rodilapupinuzataj.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4246a54acbfcfa948090192bb2513d72/wamuxorozezur.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/28237927006.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pixitaniwiridikarovamig.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/susizavozejukokewado.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca21099427---virotujorog.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/98468015597.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xusamumiwubago.pdfIn PDF document text
    • http://watch62.ru/files/files/melokovalirajerugavigel.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/46839702245.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/guseropamumusiwin.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d2d57fa7---96644050951.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/77459477072.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134e2bf2475b---wakovuriragazimowovot.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/ribitezirokexifeteko.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/61762428385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+audio+output+usbPDF 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_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 17604 bytes
SHA-256: bcca7a16ba1f37f30e453f11faba932718c981a9554299a6d35e4d5f29a29291
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 10428 bytes
SHA-256: 348be7184f935f8d50b0dcd7355ee01c31f45af61557b434e153e996094dc8fa

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