Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cbae91838250ce…

MALICIOUS

PDF

87.2 KB Created: 2021-07-28 03:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb73974aa242fd4687dc6628477125fc SHA-1: c834083dae8db3715b45377ebbb0e3e6cad1a150 SHA-256: 93cbae91838250ceb251f6760a9910c434cfbc5c0fc689b457edd2633825128f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a link farm designed to leverage search engine optimization or exploit compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nguoigiupviec99.com/webroot/img/files/51148403459.pdf
    • https://mimpi1pusat.com/contents//files/93090339397.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b169cb77bbf---86233037644.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/58levkhv3r9v1pdjug8sgbrdq4/legukodokoduliguv.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba44ed56224---85828594103.pdf
    • https://reparation-mobile.net/userfiles/file/76858026553.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46749b26a1---37098567181.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c502b55b7cb---33501579003.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d3ea7db052157c4fbfa85de0c32010ae/53247903447.pdf
    • http://rubivina.com/Images_upload/files/12081890903.pdf
    • http://daiichibus.vn/uploads/news_file/20602363608.pdf
    • https://kasihpaham.com/contents//files/11379682128.pdf
    • https://newtech-utm.pl/userfiles/file/83303825931.pdf
    • https://www.passion-rnd.com/upfile/files/2021/06/29/94414281547.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a591f1b0897---wakodiradujuwudezomaw.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/jsblr1lbkpcamb6ljkn85aj6fm/57869957688.pdf
    • http://rbtyutj01.com/userfiles/files/jegekizusadipemunuwirak.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/efcf9018093858ebb7c7a482d8ee3908/68833000600.pdf
    • https://andrejc.si/files/file/80062346715.pdf
    • http://superpart.com/files/11221752195.pdf
    • http://dawahcity.com/userfiles/file/nitanimasoloxefifef.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/40297467012.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16084edeb4fa71---tiguvigewurikato.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee58a922c5---9625025299.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5cf07e57---53478795641.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+minecraft+seeds+1.14.4+diamonds
    • 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_off0000f0f0.bin
f7af95e780643539d694beaaa22d4d2f2eebeec88db07cd9baef32b561b855ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10840 bytes
font_01_sfnt_off00010a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16792 bytes
font_02_sfnt_off00012222.bin
814afcaafea3950bcf6beb827bb3b203c74ef483ab215877c376d04d0ad44220
pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16920 bytes