Malicious PDF — malware analysis report

Static analysis result for SHA-256 5729d4f4d9e4b88c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-16 14:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de747a8bb0024578d83e92db6af26609 SHA-1: 058ee32ac8f901a3d5f3e2c0fb09b53e109ee3df SHA-256: 5729d4f4d9e4b88c4679bcb44142757a73c54e8936879bd527d17f988360d5e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the structure and URL patterns are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b69c5834---83465083468.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c21b24ee565a9279b8c4d59fe82c0e93/2210439707.pdf
    • http://school15-tyumen.ru/f/muveruxesupakanotaxeze.pdf
    • http://drivingschool-brno.eu/files/30183307558.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/4276264210.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/14523ecee7c696dbc9a6fa6161eb410d/53368528539.pdf
    • http://allasclub.com/campannas/file/jojadorerebubo.pdf
    • http://computerdoki.hu/user/file/xijarobuvomesefene.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098e5e537ce1---giveligolofupo.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/569uort3t18kg8ba2qqurs7k0o/solajikim.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406b515519---sawuzotisamijefe.pdf
    • https://eltonltd.ru/sites/default/files/uploads/xaboxudikomojefe.pdf
    • http://pulsarvn.com/media/ftp/file/lezijukop.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd18d6cece---pegizutogi.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/024347ee0a228a52f7b3d884c52883b5/60105555870.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/51076712053.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b25c8f65---nunupidoreti.pdf
    • http://asea-admin.com/_userfiles/file/20210629180618.pdf
    • http://bagliodeimille.it/userfiles/files/xuzimawo.pdf
    • http://emannsltd.com/userfiles/vofosunoderululitew.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/52981075325.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160895a467c6fb---15960846084.pdf
    • http://busanpc1.com/upload/fckeditor/file/43932519346.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hoh+visitor+center
    • 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_off0000ee16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 16792 bytes
font_01_sfnt_off0001062d.bin
1174370c02a9beb1a9d720753f2b3fd76b2b779606cbb08b871533faa3ae936d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 10176 bytes
font_02_sfnt_off00011ce9.bin
4fb5fb4e58cb3c1d352dc74fdaa031214c96109454cd098e14868a35c6b5aec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 17600 bytes