Malicious PDF — malware analysis report

Static analysis result for SHA-256 13800488ba96701d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 06:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df56728fc75df0c9f3f8b4e6ccd24787 SHA-1: 886e7f3468a5df34764b5f5a516837a23a3997ac SHA-256: 13800488ba96701d6f86cb976cbc9bf5be6e7a597178e11fba50b0f1f6d5a6ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm and a QR-code redirect lure, suggesting it directs users to external, potentially malicious sites. The presence of numerous embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=how+scan+qr+code+android+phone PDF link annotation
    • http://ldkxzzs.com/images/userfiles/file/93630449713.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc02c071eb---94265497673.pdfIn PDF document text
    • http://chineseclothingonline.net/File/23323113077.pdfIn PDF document text
    • http://dgkno.cn/upload/50673710703.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a449037b6---bexenegesopexefir.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fubobejubisinimole.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/rasebedijafotixuwimowenu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/59653531601.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dta238ks4lp764a6p3h02cp8t7/92885602297.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/porutexekugunemoket.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/62265070125.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/52078478160.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/zonit.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/bosevusuxuwu.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/nuxejejokoxomapesaxuteg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144697ce86a3---50484610015.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0203a58cc---sibojorozares.pdfIn PDF document text
    • https://southafricapools.com/contents/files/42078715913.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/samosamoduruta.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/xodur.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/pefoxapiduriwakizagus.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d7d82a62---fefisilagowomaxexiwilif.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/3762255863.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/90169501551.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/kizixavenelemagepupor.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 18016 bytes
SHA-256: a6e5fc42b2be4501cb646ab3862be6c79ed07214a4f44704f99c40d3bf9305c4
font_01_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 10692 bytes
SHA-256: 7f32c5479aedabf0a1723173980ee16d54112dc2f5b9e1c69725c7493367e9cd
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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