Malicious PDF — malware analysis report

Static analysis result for SHA-256 749d52665333d1fc…

MALICIOUS

PDF

87.2 KB Created: 2021-07-13 16:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3bcf4267f005bb9d3757aa6d7d24758c SHA-1: 30a01ae8c26498dd20293649b3eadb150129a5a0 SHA-256: 749d52665333d1fcd169bfd1378aef5f382b39f47f10b6ba91846213eb5ba862
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. Heuristics suggest it's a link farm on disposable hosting, likely for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58dfc08aff---jemujafi.pdf In PDF document text
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160761a4def89d---bazos.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4cfd9e6d---deguwabetarosudak.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/4611419656.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa5fa7614---kiluxujebojatulopenul.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/seduzukariluvugeku.pdfIn PDF document text
    • http://erex.hu/upload/file/18133444822.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098d8a95eb35---fikezodezezulakawowa.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b3070b2d1---xotitokufoxab.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/76587168585.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/podasitanu.pdfIn PDF document text
    • http://asvpp.fr/pdf/47462777968.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/225c5c099be31fb32457e28cbd04d228/30721739587.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160732256e2301---defesidim.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/vazejoxo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/wanebizi.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/28786389627.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nv7cpnujr6o2vjh9j7v9aju97v/47757646230.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/62521562505.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/dasovetiduten.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dc98e3865---zupofarobopubalozubejun.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xaguxijud.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/lunezogo.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/39212f15af7fe8f5d248ae74bb43c0d0/zaxasudoj.pdfIn PDF document text
    • http://normel.org/files/upload/file/wejavon.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2c44f3d4---kidilotefud.pdfIn PDF document text
    • http://beiks.info/public/file/lokelegakinowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=advantage+and+disadvantage+of+small+businessPDF 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_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10884 bytes
SHA-256: 33c9e7cd7f992bf5b6cfd74ab15e646dcc4f75fa09c256cb623eff812dfd47e1
font_01_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 16236 bytes
SHA-256: c3d00fe60359baf3552ad9f734bfd510d07b16c2fe0a88c6a1e2b69e6b455546
font_02_sfnt_off000136ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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