Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d0e91a7913746c…

MALICIOUS

PDF

83.2 KB Created: 2021-08-23 14:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f20a1376c91fe5fc31f3dd989d91666 SHA-1: 5daac356f6beced43f86a1dcf2db533699834309 SHA-256: e8d0e91a7913746ceb26020cfb8b95866766a51726547203686105f7b3c32b03
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of multiple external URIs and compromised host links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9199

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sherpachristain.org.np/ckfinder/userfiles/files/78408131674.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6cdb264fc78c23b94cbd5b2a57ac743d/fuvelosasorobagofobi.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/015a2011de4548ffba6939cd154bf75a/safagetezelavewenu.pdf
    • https://istocdukkan.com/userfiles/files/37561188196.pdf
    • http://1night2daytour.com/ckupload/files/25272733435.pdf
    • https://cpsguffanti.com/uploads/file/67128583594.pdf
    • http://tara77.com/clients/46590/File/reromixofefepokalizap.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c79319c1---futamowune.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rqr6up2f11hgrd921c1meo9li5/zuliwowubesuvonip.pdf
    • http://beachfirebrands.com/userfiles/file/vugojadeveku.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/63606490a1a9e19cace732d9996b0bab/46864175488.pdf
    • http://daindnc.com/fckeditor/userfiles/file/rajimi.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/14602083230.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad051f6cb00---tuvagifewutunanepefafokiv.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/8896719181.pdf
    • https://consurs.ro/ckfinder/userfiles/files/53685273208.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b6b9e033---funufobawutaxodufelis.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/nipun.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/34250714049.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41068153a---duwonotixirun.pdf
    • http://truhlarstvisollner.cz/data/file/soxutazure.pdf
    • http://masan315.net/board/imagefile/file/lowidawovamivipu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5ce8048cd37db7fe46163e36dee0639d/95979610957.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=low+pass+and+high+pass
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e3.bin
be4b05b22b480b6fc932a5e1e2669770a881291710f466b3f30ca847ab55cf50
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 10336 bytes
font_01_sfnt_off000100ec.bin
aa55f9315c9ed5b8b1d2a8829dd2a69d8176e97889d80b3b6f5df7253800eb2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 18096 bytes
font_02_sfnt_off00012f4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4E 16792 bytes