Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38b6b9bd0f99a31…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 23:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e7cf6477728812a662df79b1aa36df5 SHA-1: 29148561ccc368ad9aa1f8727fb436e49fea5162 SHA-256: e38b6b9bd0f99a3166559521e55a330f4d2f928b4cb44e09bb24c7868144b1e5
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including those hosted on compromised WordPress sites, suggests an attempt to deliver a secondary payload or redirect users to malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure to trick users into downloading a file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://ketchas.ru/uplcv?utm_term=android+mapview+example+source+code PDF link annotation
    • http://yourbuilding.ru/userfiles/files/jakefanuvedifafabupeso.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/natigixorevutuxirujud.pdfIn PDF document text
    • https://suruburi.net/mm/file/bixazofigivena.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/1735858683.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/8742006741.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/naziladibajawumifasat.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/diruruzitebipuxulisod.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/lokinebevunez.pdfIn PDF document text
    • http://shesob.com/file/files/67632414748.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/10240973692.pdfIn PDF document text
    • https://shunnasato.com/87794689777.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/16762542709.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatulifuvata.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/7068147793.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b812171f42---rituworinip.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tinasosudalorimobirafat.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6aca83be508c93d844325aea3146343a/kixujabowel.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a39d37773---68655676400.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/wonadodasunibume.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/xarume.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210902150533.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/gojevumap.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/51734841770.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e586ed2ee---gedepesevasen.pdfIn PDF document text
    • 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 17796 bytes
SHA-256: c78f70d347e8a4e9b46868936e3717fab61504de60231ea0223983e4c3bd21a9
font_01_sfnt_off00011992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 10912 bytes
SHA-256: 81db860d01e610da85334cef73c6a5ca5cc018e2ac4b3ebe37130565ebc8f448
font_02_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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