Malicious PDF — malware analysis report

Static analysis result for SHA-256 0071ea869e9e115f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 16:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce41d922af64f35d0e370c1e9e8f3e7f SHA-1: a0448cee10ff0d6e2e41834dca8b6c5cd617e583 SHA-256: 0071ea869e9e115f53e41e38fd9a58352f0523a8bf2e929a0a3d5cd9d1391854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef48cbacd---tekezutuk.pdf In PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/vevomalutoxazifuxo.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210712221516.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/patuwezoxi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf99448399---39563807426.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/7b77b45ff3a9a69b3f0f84b0da626be1/lesafatal.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160773472d6b55---76942818436.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/35261640429.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f72e913d8---49251206368.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/88297944461.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/gewarumas.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/gifobonupotejepazovuvar.pdfIn PDF document text
    • http://goldia.cz/data/file/xetofaxizivowe.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/zolamegimolelel.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/96451746264.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a03056511dd---lakelevubeveveboma.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d386aa2d26---wuxelavilub.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137fb3ab43---gasozezivu.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/digufujipepukukukewum.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ad248e68---vizusesa.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/rulupokupagikeviloz.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/ziwegobivuxas.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/tujekaretubavuname.pdfIn PDF document text
    • https://ms01bet.net/contents//files/tilefunebeze.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba711ab6a---51491481770.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f14c20e52.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=monopoly+vs+oligopoly+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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 16764 bytes
SHA-256: 3c8d7b2bbf7fa5f06ebc45833fe522a9ceb6ee3ef1e8b2806e8454bd9c3cdba9
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 10356 bytes
SHA-256: 0ec228e60bea610cfbc1cb7182ef6e4d560371116e233855d1ff0064c4ca8075

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