Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df5bc18168c532d…

MALICIOUS

PDF

80.4 KB Created: 2021-08-28 20:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1eec7fa7a4fe81b66d2bebccd5ca89d9 SHA-1: 21a4d8e61c0315f65afd714e30be7fb42f65795e SHA-256: 3df5bc18168c532d395314d45d45b39d9adbd81d26e9819321cdb56dd1089f68
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates attempts to execute commands, likely facilitated by embedded scripts or exploits within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://ambulatorioveterinariocamali.com/userfiles/files/45543571447.pdf In PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7524791c69---54252108452.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/pufepig.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/adb94a721ffae2f57250ecac2b6b9ad4/zotakopiwa.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/pozurog.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/labolasutijazavadunoji.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/61776316793.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xaxurenikebuxulimavegu.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/duwojez.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/panabukukoz.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/64333939707.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/58383183388.pdfIn PDF document text
    • http://industrialdevices.in/uploads/88521058681.pdfIn PDF document text
    • https://digireg.sk/upload/texijunalorunejux.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/7263327645.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunepevezone.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/f0n05piefucde3iq4beatn9cov/detomotonije.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/palupokoralujiled.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/h585c7ip417scqq1fn7pbrlft9/gozuromi.pdfIn PDF document text
    • http://centrons.com/uploaded/file/66696306960e67c2398bad.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210813111408.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/aaea3c3d5fd9c0856a65512ff190dc5c/59388531842.pdfIn PDF document text
    • http://palami.by/images/file/54974940910.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/wunerenosonapa.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608224835bf8d---kokorakikesuroxozo.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/83576371908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=open+device+manager+as+admin+from+cmdPDF 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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 19040 bytes
SHA-256: 4f6a116f495e0bfa3f9259f360c4a3341844ae55b123edd2ae7ac1599e6d8ec0
font_02_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 10908 bytes
SHA-256: 42b49f0f874d61a8c7c84833606293a1f8adb276e779581bd57192bcbfdfe3fd

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