Malicious PDF — malware analysis report

Static analysis result for SHA-256 4108b178f51ef758…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 07:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e9063e46d6620e45da903f925def4b4 SHA-1: 84339a6bf1ade1ea6d32283a6c7b3cf6cc50ac62 SHA-256: 4108b178f51ef75891c68050d847fcf0245844b5e178d0691926afa88d32f3a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/uplcv?utm_term=geology+of+lower+indus+basin+pdf PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bda82c6f10fefa6f51ddfaafe1cf9e6d/30996184745.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/xujavikigamurejofijiroguj.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/zatobanobipudoxow.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/vebojal.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078097c37d7d---laligazegakopif.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/58398e7ad62bcbe3216c26d2f3bef466/nuzevojamodexe.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/lelufigasikeg.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/69556144017.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/22893996834.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c47defdacece8ea0a0083ce0c094a5c6/78409549632.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/famuziduge.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089637ade04a---lulorutufufifiwidexe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ac816da5---fadisuvol.pdfIn PDF document text
    • https://chptravel.ir/data/file/lijor.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3115c1665b---gaxidasiredunitanoluv.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ha3b9td85bfljneo19l87an48b/darawexifavobuvanomera.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/nesisuxolofoputitu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b68c274dba41a4634122038925cf8cc4/94128815947.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/levone.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/87552b15e74c05ffa0b036d1e58cf753/12331419325.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_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 18012 bytes
SHA-256: d40e28bc7614d2a114eca099706ed1bffea86063c46734bbd415ea03ef3a23ba
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 11052 bytes
SHA-256: 586e529b42459cc9c7018aa6760e27036d847bc91d386252bf58328fc5d47f22

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