Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40e567f6006b8f…

MALICIOUS

PDF

82.4 KB Created: 2021-06-28 02:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a02f1643aa0845cffe588c7aeddb97f SHA-1: 13f058ed070d47fa943b00a9aacc1f94d71192e7 SHA-256: ef40e567f6006b8f125de5cb23632c06bb8d700508656c77ac0b178069961a28
156 Risk Score

Malware Insights

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

This PDF file contains numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce60e16b86---3142538553.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf01501edb0---seludodegewal.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/906890b858e17b52878f3effc7cb8c2a/44400563122.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb40c74a4---80437728741.pdf
    • http://imaginove.eu/data/Files/61297200499.pdf
    • https://baohohoanglong.com/userfiles/file/59512751055.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/97506011670.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d4170c0fa92b47109248464f24155bd9/42027793819.pdf
    • http://a-kamen.com/userfiles/file/buxigududovere.pdf
    • https://castel.ro/userfiles/file/51470169801.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab936dd833c---95175017984.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qe2ffivhkp70p1fl51vt4uc8ad/fufaxetatoguzuzo.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c38e4abfb---2937977559.pdf
    • https://amrapalispot.com/userfiles/file/nibaxobilujopulixukev.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b69f9e5---51112094989.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/907301609.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0148a8efb4---79053489062.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071226f598e2---74971233108.pdf
    • https://aimara-bg.com/userfiles/file/wekonu.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081c90fd4c5b---sitix.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/kasurevuwojezugun.pdf
    • http://amdind.com/userfiles/file/24444155123.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c44a3b13ddef6ded327f270e2f723bb3/37352271836.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731905aa290---64825101618.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=suffix+definition+name
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000ddd8.bin
88311aa143c0282c2efa2002f1639c4a1488d1648c3c49202413930255c23de1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 18076 bytes
font_01_sfnt_off00010c84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 16792 bytes
font_02_sfnt_off0001249b.bin
1a2c51487e46738941bd6939651e7a0bc82448040c35fc3b03251b4479ea8971
pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 10480 bytes