Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bde1878d57c35f4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 18:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f37948d56181381d671b8b721984b922 SHA-1: 910dbddd1740473f584778c71318007563cd7d38 SHA-256: 3bde1878d57c35f40b1123dfb1d143feb8dfd728e4cea135ef3a972077f3385a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=fall+guys+game+download+for+android PDF link annotation
    • http://tongrentangthai.com/UserFiles/file/fobagozonedebasog.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vupafagutumudaka.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wotaki.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/99086676499.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210906085022.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e1355807440c51543e434e0e5f58080/miwibisegarupekasewaj.pdfIn PDF document text
    • https://ip-pharma.net/data/files/84005598978.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/ralobosutabenuxolarufemud.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/tezifori.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d6fa1ec99d9530306b85d1bf7face6af/zajoboxeru.pdfIn PDF document text
    • http://mamitobe.ru/files/file/gimuroziri.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/ziruwu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec9beb91a---76130367005.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/78614405867.pdfIn PDF document text
    • https://totounited.com/contents/files/savefanuvojexapegida.pdfIn PDF document text
    • http://eventechsite.com/files/files/97401225950.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/jexevutesubutin.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vapot.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lumuluvawipuz.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/97956424825.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210908_221127.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/65673342751.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_off0000b694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 10876 bytes
SHA-256: ef2509cfc253fc8704e234646fda1de208bf6fcf4b1f1292598023ef407a9202
font_01_sfnt_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 15936 bytes
SHA-256: 7f0bccecef9d6ac6b88f780d2a675b71ed202f2407a91fee59d3b1c2121070f3
font_02_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1