Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ced5c9b1e7b44b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 22:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3662202946bd340baee523c140857723 SHA-1: 7743fbf27bb83098664b508558aa43d4395af0d7 SHA-256: b8ced5c9b1e7b44b6e008ec544eace0947d7849f1aa2427fdeac828f67b62e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous embedded URLs, many of which point to compromised websites or link farms. The heuristic firings indicate a link farm strategy, with some links hosted on compromised CMS upload directories. While no scripts were directly extracted, the nature of the URLs and the ML classifier's high confidence suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pixomot.ru/uplcv?utm_term=mlbb+easy+hero PDF link annotation
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/monegujunutomipokefagola.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132954f2fa38---lukomotekixepikasowuzol.pdfIn PDF document text
    • https://sino-islam.com/upload/file/220729331741.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/9530766596.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/kowinodekekozutaxa.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95510568695.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b6aac0e6---58198011757.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ruweketos.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/fujojafemuzamil.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16145cbb45d0b3---62956170767.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/63826600360.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e9f2dda25---86964178509.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/73064004597.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/migetogezafun.pdfIn PDF document text
    • https://12shio3.com/contents/files/32794691101.pdfIn PDF document text
    • http://vswet.ru/f/susojaxuv.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109050157403223.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/pikoli.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7528368222.pdfIn PDF document text
    • http://cmtsport.com/pliki/jomozililolujeberoxenoda.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492b0b6c38e---pixid.pdfIn PDF document text
    • https://photofetimages.com/temudipobovinigirusorejo.pdfIn PDF document text
    • http://surausa.com/uploads/files/65677080131.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/raluwigiwit.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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 18876 bytes
SHA-256: 33adbc70711ab8178f2702f8399291e2cdb8061256f584306371c5ef15a46554
font_01_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 10160 bytes
SHA-256: 12d6ce11a2072df3bfb94631f82219b9d8f279cc9be13f217e9b875cd0b26782
font_02_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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