Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31eff341ccd9859…

MALICIOUS

PDF

92.2 KB Created: 2021-08-11 13:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bf33250b00fd7c57fff9331e29ff575b SHA-1: d69e772820de5de6c84f921854571b86a94b3adf SHA-256: d31eff341ccd9859512b778ec4580afab554336b445fcb03d5a3f59fea911abd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The heuristic 'SE_SECURITY_BYPASS' also indicates the document attempts to instruct the user to disable security software, a common tactic in malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://cructi.ru/uplcv?utm_term=kinemaster+pro+mod+apk+2019+for+pc PDF link annotation
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f07803bf75208fd36b2a118e855a36a3/suvixawefogaviw.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/81769901006.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2cc5737e---64598116029.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f939b0bbb5---75218216075.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa2fec85008---modarimasobelinila.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bda09c74d0d252c09c8760d4fb6d8b95/8472572279.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae123dbbfe---gawejilov.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8f6c994d---91224880692.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89af75dbc---reruxilasosotufolorolawan.pdfIn PDF document text
    • http://marketingnews.fr/images/file/bopujuxovoni.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/88217203381.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dowedu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094089960cc5---56305599577.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d08keprkmc2o4ifmksgtf02pau/10904480876.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102d0586ac---23569355312.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vixupazidoluvefofumukepa.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5dacb173---nivupamesusuzodogor.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/52984878290.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f5c53b832---63638669697.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/61315160583.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c550b7582---sazubijonuragesawilewiwiw.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd94a848e---22451605575.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/witokoraxu.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/cedc58fd22312b515a8ba63bb4a35577/73632162277.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed5bbee45---89641763849.pdfIn PDF document text
    • 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_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 20088 bytes
SHA-256: b346613f48824369f594c542de46fe826479f27b66558a91d4a9230b2f5dce33
font_02_sfnt_off000147d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D7 11280 bytes
SHA-256: 4f48144a069074e0299232481cf7c60c15e6ae470c7c7287fe62ad25f53f2df5

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