Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e2cf01abf7c9ed…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 11:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12fdf7a2f56451a4d094a6154f482f7b SHA-1: d6ef3be21b4fd73c1216690fb58008b78b30ae55 SHA-256: f8e2cf01abf7c9edbbc049b39f2193796ebb7cafc5c55d1d184ad0b0b7743703
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to potentially compromised or disposable hosting, suggesting it's designed to deliver a secondary payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document instructs the user on how to handle a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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.
  • 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://allprintusa.com/admin/images/file/wivovumuwolakutusinaf.pdf In PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/tidoxijisakeru.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4235c2f3af2fa1f2c7c2b5ec51c39a91/35130413812.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/39112357891.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/ladagu.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xenogadotidupamakew.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/kudumenatuvatubanovorenoz.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/666475592.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1ad51e079---sadalezoxetijufizufitevo.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/62586086658.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/50533169916.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wopuwoxosu.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/32943187803.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89059133309.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/13993480650.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/gamugatulefoxova.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210902_C2B69C7348D0CC4D.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/xixaxakejoboxo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/12737186728.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hhed3osv5up3rlat3a1jbpbutq/kotogigotubome.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac705912cf---64824905637.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8a773cbb2949f6100ad404dce0fa709b/40142614378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+unlock+my+chromebook+with+my+phonePDF 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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 17184 bytes
SHA-256: 69dcd98ab880ca3dee9ea6681f4049d1d12adfa1e705a01893a14802776e1085
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 10972 bytes
SHA-256: 5539c02be17528cb4ac8adfdd93911d81a48035a43a8868b15f33844d9950b52

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