Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b6e626701c9e7b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-06 00:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c91c6ab888e407808339d504ead108c9 SHA-1: 10a4ae27ad9e05097eff235a6036f10cb49df11c SHA-256: d1b6e626701c9e7b1b302ace3d249a22b71e62d3433c4d679bce9f3602086284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, many pointing to PDF files on various hosts, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://allseasonsart.com/uploads/fck_uploads/file/60521494817.pdf In PDF document text
    • http://xprchemical.com/upload/files/nizop.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/duzetonugofipunirezupidix.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/4556290165.pdfIn PDF document text
    • http://recrute.fr/files/files/23077188529.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7ldqif3ef10h74qbcdjpibn8at/kefebuw.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b224be50f4---riwaferiluwukovifu.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/suwif.pdfIn PDF document text
    • http://axwelindia.com/uploads/7712923704.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/4155891798.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b008e87becbe29be5c21dcfbc36f70ad/fitomenivozevu.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210612062806_fmhadi.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/54219111764.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610cdbdbb4b32---10445564676.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/2891837b0169e6e79798bfc1de274973/lazanepigekomosumuka.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/bozol.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/47318122581.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e1d5e1a22340c98496cb9b79154a1a84/rupisominisezasano.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b209c4540---91588394156.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e38fd36d2---batorokiwonesanox.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0ct7sbgeat4ib6tp256qq9kac5/wokovoxi.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/zonozuxo.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/fozus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quiubole+con+pdf+chavosPDF 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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 16056 bytes
SHA-256: f910dfc8eb231e5c2ec0e8edbab02e43dcdcffa3da502f179bedc0fd05f05112
font_01_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 10884 bytes
SHA-256: 4603acc15c57799ca0e8525420e15cb5e80e897e0d3433d92e63bc660d9a0cb4
font_02_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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