Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01a97b621900063…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 08:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df35939b247dd27f01e2fd14e6f5dbcb SHA-1: ed5e0db9c784b363d3d6d57880a56f46dc1dbc91 SHA-256: a01a97b6219000638ff2fa56e93078308ffd55d9155b40abc7a0ba623e140359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 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, directing users to multiple external URLs, some hosted on compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or phishing sites, likely as part of a broader phishing campaign.

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 http://soluzionebenessere.eu/userfiles/files/tonopomemugetuvopemabod.pdf In PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • http://temple.mo/userfiles/file/tominuromakopebabusevitum.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/polukuxokujekimigubikudel.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/xekipodabenalimerixiba.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/jelitujoje.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/29646648979.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608315e88ba7f---18346703005.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/74f1e8577aa015ae6306b784efe95c38/dilubevijuxolevuru.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/db6180216f74ae55827ac4aec9ac3190/35796362451.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021071704571493.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1065747ff0---69707812203.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/8227898063.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/9ofp99ti28gcniq0unem5bdi9o/87733093073.pdfIn PDF document text
    • http://dsagco.com/Upload/file/24947856467.pdfIn PDF document text
    • http://domuran.pl/files/file/60468407142.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741bcd1e20d---pigiborofusijapegavulal.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210901075316.pdfIn PDF document text
    • https://landbar.com/upload/files/jupiwugepejazunedejox.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/25659700808.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/bulexutepixupiravara.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d7bf4fbc72b1de17661daa07c43a68c5/vujokulusijarananezizez.pdfIn PDF document text
    • https://asi-filter.pl/files/file/naxapoluxatemugip.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/vopijapapapopixekedadi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab830630b7---naxedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=uk+university+interview+questions+and+answersPDF 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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 17452 bytes
SHA-256: 503fd26f1b581ea2fd479f1d12c1419f26e237e6f94372ea518a2aee630212fe
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10808 bytes
SHA-256: 0ae8cc4e87585f647976342a16514e65028f888c9f17d0cda9bfbaaaecb03ff9
font_02_sfnt_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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