Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cf1b24f5baf692…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 08:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6cee77896b1d0174ea1ebe2e7eff888 SHA-1: fafda39e8c1da53653dedbd870afb917636dfc39 SHA-256: 36cf1b24f5baf692480f6369c6a9c4e1c565efb4a9eb7a30c34cc46d1ed4941e
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. It functions as a link farm, directing users to numerous external websites, many hosted on compromised WordPress installations. The presence of external URIs and the overall structure suggest an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=interview+questions+with+best+answers PDF link annotation
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828eb5b4cdc---575331842.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8793ba1ef---tafage.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/k9h0ufl4kf07gg1ejccqalom5b/81396016253.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/12886511223.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b6b53defa816011cda99e1d279b9f67f/mafurawabev.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e312ae43345---rimapupisepigibo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16094630d1b16e---17891959250.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/kibuvumuv.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/25828255936.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/dobukutevomosojudular.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00aeea6b6b---sofido.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/2816817142.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c01f9046a---40493569540.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/94365393681.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/mekubegafetimefafi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lb2k9ter917qr7ueuqickk2kk4/92740223235.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/fofajarufaseba.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe1f8b5367---sexuxowukubigisomega.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/faa4ed690710e250d9dce71075f30b49/kaxezafokesuzo.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3cfee4d55a05a0b6598b98b3cc78dcb0/wibibejebidemewefipup.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/tezezu.pdfIn PDF document text
    • http://keacg.com/upload/files/tedafunobamiravupoz.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/vafedifilokib.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_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 10648 bytes
SHA-256: f5fdb89657c52850716f0caedef18c11b10447ac2e3e32121f70a1b9d820d267
font_01_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 17904 bytes
SHA-256: 49166bd316352120c403cabdb8007b883e68755699cd56f28a273dbd2e10b50f

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