Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc36d35ebf570cf…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 14:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2282a82960a8c0354e904cf0035d3592 SHA-1: 2cfd1c74e99cf4f27cc86043136c96bbdaac2aaf SHA-256: 2dc36d35ebf570cf2df77eab0f003e4708b98d15dbf9378b40fd9742d3824673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=electrical+apprenticeship+interview+questions+and+answers+pdf PDF link annotation
    • http://maiodi.com/userfiles/files/61288597893.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/xajolaxefezov.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a0749d1a6---96593982954.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/othh3pkbiihjaj4qm4tl5r3hg5/wukotemekubakegiwetaxove.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/37702134288.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/20737240910.pdfIn PDF document text
    • https://mmszke.hu/files/file/71802429086.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da00fe45a2---37246544682.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/talusatatuzolewarezadowol.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/15647794851.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950f7deae06---sizazunimegabifumoz.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37521df1d---benepusevukimutix.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608090800c236---wuzebewiteginosejofev.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/mexukagotirimedafivi.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a87855662152f8fc8837927a840e979d/42858285804.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/74787017944.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/gepidokaruti.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdfIn PDF document text
    • http://aa-nusd.jp/tanap.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/10049756431.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/10449590989.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/14028642068.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zosaxabiwisuxu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906985316fa---torewifezumidadub.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/salevur.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/jogikipirekokekamoxuke.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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 11096 bytes
SHA-256: fd88ca16682f95a7862f61a631d979ad3056a45c1dfda1ac74cc38f4a9b0340b
font_02_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 17452 bytes
SHA-256: f588a4643db1e3c9c2ac71572335fb3a25ad670bb069b390b90ca811131f3990

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