Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3efcaef6a86bd6…

MALICIOUS

PDF

73.6 KB Created: 2021-07-04 21:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59c034b58196fd745fa4d663bf6fa67b SHA-1: c5054759e24774c376fcdaafcc806115e875b5ab SHA-256: 4e3efcaef6a86bd6ce563f7da8aadad974af1ffec3f1d33a6504ca5dc71d1450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://watthaistuttgart.de/userfiles/file/vonolevogulutujutefisavi.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b453607c4---59994976383.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a162dfca52d---digexosoragid.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096652436c45---62501768459.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/85265257236.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6bb8a8e459071e0ac48ab7ce169de785/8238035476.pdfIn PDF document text
    • https://laps.pl/userfiles/file/gezitexogo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b4akjcp9iv8hh54tk3ld6cfe4t/67037616415.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/fc073bdceb2d4d11754c5e202c073fbe/58419345555.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dc880bdf---36161892551.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506234815195408.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/64c9b41c76f12341a0f6d15a679cbfcd/kupiroderuxeme.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160756a7a7894a---48431942875.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/melomujudejodofifuw.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/donukiwomivawalo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090705a3bf17---60774640822.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a35e2d8ae4fc823ff6835cc5484479cb/12310667786.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/pakokituxolemit.pdfIn PDF document text
    • http://dgjst.com/upfile/file/70839057663.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/shaqlodf60vnfh6271fmsulaq0/tebosaporafovemabi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/85607513462.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/widenuzomefiwuzudug.pdfIn PDF document text
    • http://effektfilm.de/files/file/gojadevabek.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/7440040487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+minimum+number+of+fields+with+each+node+of+doubly+linked+list+isPDF 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_off0000bc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC21 16400 bytes
SHA-256: 510cb447df3156500cfcbf11d4b235decd351aad7d028ce88c89b3c659413e72
font_01_sfnt_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 11236 bytes
SHA-256: 5e8e6d1560ea7d19d7f317ea064178d54d22e2ecc25f38e77a8c5f86520f6928

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