Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2337860e5b721fb…

MALICIOUS

PDF

88.8 KB Created: 2021-10-15 23:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d7cb8aabae78d9439c1be447d31dd697 SHA-1: 0cde27024091a21474385a5446148a926a03bc57 SHA-256: d2337860e5b721fb5d35c2aa22227b88b785920b9cde368db1be9859a365d1a3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, aiming to trick users into downloading a secondary malicious PDF. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links suggests a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://ksmt.edu.np/assets/ckfinder/userfiles/files/rowabudisupofaxijevug.pdf In PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/ziturezusebivirab.pdfIn PDF document text
    • http://pedraferro.com/files/files/83464296745.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/236d62d896b04a2f25369b0813187cd8/wogefodisegepoxinadu.pdfIn PDF document text
    • http://bresky.cz/res/file/44345020836.pdfIn PDF document text
    • https://coevent.ru/upload/files/dorojakexiduxawoxowol.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/puruxogutusuzugugi.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/76983429046.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tupetogudupajosikabiwabu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/28f6f327e692df024c793a0af706535d/99549974956.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/70420347398.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1615cf66298cdf---8822286258.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/90872834384.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16155ef96e0f10---moxami.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vixaxuzanidov.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153564061310---7637767874.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/02b1a68ee670a1966c2a597ba787540b/73698932542.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/robuwubazagi.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/sufunu.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/nulidevakajowutipejara.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xizipusiv.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/38528770897.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/kawikutupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=download+plants+vs+zombies+2+cheatPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 11152 bytes
SHA-256: c99f2a76dd346fbfbaf3efb8aad99fdfcc6f4086e898fc86c2a5e28b46f1cbec
font_02_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 25436 bytes
SHA-256: 7b964e9e7c195e581947479a557da5ec7dcfd5e6e9e5787912a6b0efcb75bb7b
font_03_sfnt_off00015139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684