Malicious PDF — malware analysis report

Static analysis result for SHA-256 909a82b547efe08f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 02:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3aeaad39a3bb3aface06fdaa38621c7 SHA-1: fbb3e83ea8b30b324e8b1726c65bf4ca53b52331 SHA-256: 909a82b547efe08f57fb730b9e7af35a8b8b666e61f06ee75f957283f2df50f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://guowangcable.com/d/files/31257852650.pdf In PDF document text
    • https://stancijanegrin.com/UserFiles/files/78388087195.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/famuxozonowugumutake.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/11240326160.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210905235523.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/27123137087.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/bilokixota.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/kalodubowurego.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/20799493011.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/pomedifusikasagojugaketug.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/18563866726.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/liwexuxanuwunudul.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/1e94505f8ed2faa28403ceb597033a09/14604333678.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/bulapuxejomekepapobexelej.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad561e0fc---fufuwinepitipozimajo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c47d17c20---zisenofimoti.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/wifolagovewosi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/30274220133.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b313030970---pozin.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/3066e0.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/kixasujuzuwewago.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/80965819029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=automatically+send+sms+based+on+location+androidPDF 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_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 10868 bytes
SHA-256: 85427b644816a5486ea4f65ba38f74e81cacf21bfc77d4f3e3b54e7ef19280c0
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 19084 bytes
SHA-256: cd2340adbbb0bdefa99c769e77fd3a46a41aa28d639e4ccb4ac4774a5d5b8073
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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