Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc6e00df6c32300…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 05:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 829acab5bccf208bae82c7b68c1cec19 SHA-1: 55c4ee319e1e9b3746c1e19263e1a0c53e5a7da8 SHA-256: 5dc6e00df6c32300534a2649af4fb1748b065d5769c7bdd7c734bfbaef588f06
156 Risk Score

Malware Insights

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

The PDF 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 compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://architects-desk.com/uploadsfile/98324827783.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/594db3d985ddc6656ab82f7acaab1e54/69215712162.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bd938571---buvegixuruwewileju.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ntar23ci266v66e0rkc0a4do9u/gavajomim.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8d743635702053b259d1e1048bb284a4/27574898987.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/zivujej.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/29269542247.pdfIn PDF document text
    • http://simonide.org/userfiles/file/18185244271.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/lufolovatexasabujosebude.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084655572e02---julad.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630705b813---88403251058.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d400db41faee6c3e07f0dc464b746e16/rigawiluridegenedezepugev.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/fafat7ejh07uh4kfdrl3q9k04t/19669478154.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/2837f11137506bdaf29297c8289e46b8/gonawakiponataranebom.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/36a8e7e1f1b8ee5d4a5bce54ce292d08/wuruxukakurimuruz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf08477c5---wovokaxigozujapupivajadep.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lu4ekq6dofn79j5dno3b58ukv3/simefasaxarunoliwebomabit.pdfIn PDF document text
    • http://sun-eko.eu/files/file/pugipobikukagex.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a8191b2df8adeb5ae5b9e721a2549656/pufuxomofukisedojo.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/wabumakunixizomini.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d739b2c285---48977486479.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7k4pkemg0hegovft2cgc7vspp1/ruwedivezowelekugago.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vodusoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=13+reasons+why+web+seriesPDF 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_off0000f2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16868 bytes
SHA-256: a9877962d5f1c25fdf03baf9a00f698aa1a57b04770c484ca9fc23f1121d8d36
font_02_sfnt_off0001367b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367B 10528 bytes
SHA-256: 671bb4dc5b6b939303d9d409e85904739c4aefc88bbea1b2ee9cce6c0ac47724

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