Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1423ee22bbf4eb1…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 21:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ca320370ba2e58bd660ce7ab5ae1844 SHA-1: e88c1f5a0803cdd5a6f4d553905c4b65b95378db SHA-256: b1423ee22bbf4eb1dd9c2a78179347297bb0607f19fd80c4ceb00899adb190ca
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=umbrella+academy+pdf+download PDF link annotation
    • http://kutyasturak.hu/images/files/jodiwinap.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/mobiti.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/vupuwojelowudewuvofaj.pdfIn PDF document text
    • https://angkalaris.com/contents/files/1375192122.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/71298186850.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/82379589731.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e019acd85---48567787127.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/8260214565.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/26965158038.pdfIn PDF document text
    • http://ropesadventure.com/d/files/jajukezipepi.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/biganegesebezuxus.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/pipiruvifete.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/45937002581.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021092320462633.pdfIn PDF document text
    • http://artio.pl/files/files/xolabadesefixepibanija.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614248ee75b7c---pivovamevixif.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/22177811987.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/vojojinijekoloxemufemevav.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wufevezasobosukumivubobu.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210901_D0D1B056E0718A14.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/356342713.pdfIn PDF document text
    • http://sinoorchids.com/image/file/gezas.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/44101986248.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec8eb9f944---pegumusud.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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 10768 bytes
SHA-256: a16c672501586d010f5230a17825484da72b1371a9884fdc2ab8604fbe1cb4a0
font_01_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 17764 bytes
SHA-256: ef548f290822af4d8b3c3d16840f6ebbca4abbd8add37a643e5f0617cbd02018

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