Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66bf5a1845088fc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 23:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 31ca6bf59a7c48e9abc680a2993b822b SHA-1: cefaca35b7079d82d22baa9e20155bd46d02f4d2 SHA-256: c66bf5a1845088fcfdcd0082ee38aaa5d1ee83ceeafd9c670acb39b2f1cdf584
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cuisinescartier.ca/upload/editor/file/41538277254.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d8cc0ddbb782519196c106ef98a88f97/29379622904.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132e90ae304c---22995360510.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/89602116080.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/jaxukibatekagunuxi.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/leruxawamasuzirilufena.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/kabid.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/44177944809.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/21831265665.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/dokuxula.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/wuvojasepo.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/libanezabim.pdfIn PDF document text
    • https://go2germany.ru/files/file/jepeloz.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/95871801876.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mepogejesazupemapawadibuj.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/kowum.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/56763431233.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614312c9d6077---39502471469.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/54044196333.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/17388012261.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/95662228719.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/84fb6ogspmul457uemmn0fjenv/kewejezip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+change+dial+pad+color+on+androidPDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 10700 bytes
SHA-256: 420c7af23115e164be1e97ea2ece1853e04088062bff4c11998e15c30b598eff
font_01_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 17992 bytes
SHA-256: b120e50d65e2bac1d9d4e17692ac7006ab920e1831893585927400e5447be9fd