Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe1a4299873d3b2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 13:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e4523a588f2a59c9c360f88ebb9349d SHA-1: d0916688f13ec6e46e52bf9507c9e01256b98405 SHA-256: bfe1a4299873d3b20c2383c256308a0d4e545f942eb67404a3c5375465a0eae7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. The numerous embedded URLs, many pointing to compromised CMS upload directories, further support the likelihood of a downloader or droppper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://darec.sk/files/files/xirimodivuribekuridez.pdf In PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/rdcb2u3l9uvm726s5dl1lb8dvv/96557465818.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/67769932345.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/1066445106.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dl324oqb48f9b7g2ktshc2cer6/zegoferawirubedajoje.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/natela.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc24346a52---suxawiserinoviw.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/250144004103.pdfIn PDF document text
    • https://bursac.net/userfiles/file/28203364827.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/82878690881.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/jokodufavepax.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/22097603397.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ctsb8ecgrthmjgu69itit6lvg1/89487831026.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966030ef9c2---nupaxome.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/bojebuw.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/semejanadibika.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8e8757359005f33fd12e5848de7adce7/89293831953.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b3bab81cd---bugaturilig.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7ofdtfse686juemuavm7ltjrdb/xojelelawuledikerazob.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/rididesatuminiroz.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a846559dfa8---61656458892.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5196a853945a549c273a9f61ccf6ac36/zovasizosuvaderasoret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=combine+jpg+to+pdf+in+one+filePDF 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 17304 bytes
SHA-256: 17c2d239a4a2eb25385aee2b9ae6a0aad7e40ef72b471b7961d5530fb958032b
font_01_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 10712 bytes
SHA-256: f4de858bd1b615d064f31797002074bf4df82591ed6fe8b15cec992edbc97e9f

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