Malicious PDF — malware analysis report

Static analysis result for SHA-256 a403f1e23bc328b6…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 15:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76cc78719f0555bfaeea8252c80a2634 SHA-1: 0ddc79813a0b37768e6d2356c856a275437cb775 SHA-256: a403f1e23bc328b616228c8c9ffafc99a41a958ff6bc83faf1c56500a83e3302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://sisparts.pl/zdjecia/fck/file/ranomut.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/555d6df50a15e53b792ca4c682e7d602/zapiridudib.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c4e11a9943802883d2df90036f95c1cd/vazinavukom.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/nomedaxewomoxejonovegudi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a15a1062---xusokagojaxumiwovutomopu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b3khrp8f7dkvgh4m2ujues8los/kazuvejosereravuv.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/43057496056.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8c3da206---57860238332.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/lakemaboxamamafamipu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b79a58f5298dbea25ef21e60e3be4b15/24110012945.pdfIn PDF document text
    • http://thaide.org/userfiles/file/pozonutikexek.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a4d1e0cb0---82932423583.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/kaxigupa.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/92811224249.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vemejasaxa.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/40408323887.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/32078505052.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/pevexo.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/dobamowipojinon.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b5dcda32---kowebozepidoseroduzal.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/vizuv.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dijoguzekegemaw.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/datimipugenafurat.pdfIn PDF document text
    • http://ipceurope.com/assets/file/sumesuragaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=budesonida+nebulizacion+pdfPDF 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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 18356 bytes
SHA-256: 82007489c140efafb28c1e180d7697c81c136cb9a101704ff975b35e7d3cc154
font_01_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 10768 bytes
SHA-256: 3470005cd1608e19035942f1fc2913a4fd72478fee1c5061ec9c5fc33b07a68f
font_02_sfnt_off00013472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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