Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5de1120e4e703b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-02 10:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9de23a98efa62094c7bff79170872f5c SHA-1: 070a67b0b79210ef57baff590c4d811916cd12c6 SHA-256: 0b5de1120e4e703b1782ccc70909fd6915fe9d5c0e1898f3261fc5d12502fbf8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links suggests a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/470374rmlpee2q0rm9uf64kd42/zojilenimobototumunaromo.pdf In PDF document text
    • https://totounited.com/contents//files/zozejusunumuvujarixibuxum.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/30371672658.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c4a08f47---novikorapigokob.pdfIn PDF document text
    • http://fitviewer.biz/files/file/funulenomasejigefipasidif.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/fuvurusopezo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607949afbd0dd---88828609617.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/26201883724.pdfIn PDF document text
    • http://proxima-design.cz/files/file/69352844597.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609e5628e6d80---genogijolamafepisumam.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/73462540425.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d07d933e---patelaruluros.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/mixemawigivadaka.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/toxalogu.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210808_134859.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/22203afebf57e64ee848f38aeb0a9e8c/93673311019.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/41346721047.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jozenebamuzetiwuje.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jldgm4a5g88ara5uafm6a0f9i4/pojazabubef.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b107e7811a---kalebit.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609463f70eebd---30532105229.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/db791f20ac4f6ebf2d74fb784cc73ed9/68698868872.pdfIn PDF document text
    • http://aweibel.com/Photo/file/xisifa.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/7dfffba532ba406603e753fd190f89fd/ferije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=is+whom+a+relative+pronounPDF link annotation
    • 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_off0000ce13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 16188 bytes
SHA-256: 126acf9876ddec0732dcc5d71fe46d1d1eee4d4b1cd3bc29ca92160ddc8e6fd2
font_02_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 10720 bytes
SHA-256: f5e184828e3f835f3555ee1d90a57196b65927c51746f30762ea212e7dd476e1