Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c31634c540f8070…

MALICIOUS

PDF

105.2 KB Created: 2021-07-05 18:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d27bd9762ae4e772f38f581ebe8c2f6 SHA-1: 85d1f915fd4a36b8a6995934abdd89a9f7d3085e SHA-256: 7c31634c540f80707f9de3663b939278ece4c0a65d9e8d16f94dc4e5fb677b7e
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The presence of a 'download' button lure and high ML confidence score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure indicates a malicious workflow designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://protok.pro/upload/files/32032446684.pdf In PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/51072190559.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/zimivaji.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/19331354391.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160705ae4a915d---6592439156.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4f3fbc7c5a92c84455a65c35ee7b1ad8/44024164374.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0q3dhhfpmgo2pffikp52jo3bdu/93252959179.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/48266060112.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb4dba6f2---jelazaperafudiba.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/botibugulanasapuwevizuker.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xuxagame.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f6618e04---63925739781.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b759ff2a7a---43465472757.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda663994e---59736943154.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd9617c3c---82552787694.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/83443426737.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/mojuwi.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/q92jbdn71mis2k8ocmkss83sc4/47354005769.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27993186cc---fasurusetajelefev.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/kopimigusupafubizetogab.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/82062448768.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/lj505smiq1pmksel6cd7gb1j80/47930869092.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/setagapubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=spm+2019+physics+paper+2+answerPDF 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_off00013478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13478 18596 bytes
SHA-256: 7de4ea27eb71dd8ff13ce4e987a5af364b261911059b21b913e144bce0414fb3
font_01_sfnt_off000165dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF3 11112 bytes
SHA-256: b6de09f9eeb8547a99d5274c716277c86080d24f36c31e3c0879ee844f5d39ee

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