Malicious PDF — malware analysis report

Static analysis result for SHA-256 631061819dfb89bd…

MALICIOUS

PDF

95.0 KB Created: 2021-07-07 00:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2072feab6b7d19d8b175f0f82c8a44f1 SHA-1: 631688ad54bfc1a3d67167dba887dd35ef9e8f2e SHA-256: 631061819dfb89bdcc580fc778346e34e3bef9e2df9c05ee700b84515af47b95
156 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. The file functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://medvor.ru/uplcv?utm_term=good+college+jobs+that+pay+well PDF link annotation
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tsblrhhhassfmebjudp29chdm5/kumorotiba.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/6830894497.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d071b53b9c0---22970646268.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e32659f9e---peliwisaserejev.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/eebc67e151adc541eaee164786c19ecc/51347605732.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/86411004513.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/fabovavabipa.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/nubagavasiraxabimem.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97a974b3d---kapotiloniligugizemenebuk.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/36331229638.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/walilasufijuxon.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/mepogowolasa.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gocqv3hf1k3nhh8p6p9e3omgq1/firisetugadifenefilon.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/eo3iudbdt7pdudukhcetq9e5m2/39685867760.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be8a615c7---69145018973.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/361795eed06b1773048ab243e28b339e/ditovexopilen.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dlorkqveut9opmblai5pvmneln/70852268198.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/37708161945.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c779db30b31---15805424037.pdfIn PDF document text
    • http://pronobile.de/catalog/file/bamemeninapeloropu.pdfIn PDF document text
    • http://premium-t.info/files/files/496435743.pdfIn PDF document text
    • https://viecmarketing24.com/upload/files/vuxuvejagoz.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc0d2e803---zanadakefe.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/kuxaniroweto.pdfIn PDF document text
    • https://tomas-music.com/contents//files/62890391946.pdfIn PDF document text
    • http://i-dron.cz/data/file/84917033429.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_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 17024 bytes
SHA-256: 94873e3e26cdae24f4d2848b3e879d60f6ac8ebf53cc4f606a82919141138308
font_02_sfnt_off0001553d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553D 11008 bytes
SHA-256: e27d88ba56bc1928f13a2b8b7a9dc53342984e5c911123f5bacce21d335b541f

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