Malicious PDF — malware analysis report

Static analysis result for SHA-256 740dc8ce7817b5d8…

MALICIOUS

PDF

93.3 KB Created: 2021-08-17 05:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6201164f522ef3bc2d40bba253522e84 SHA-1: 23fcbb7a0610798290a293a96944bd8e749605af SHA-256: 740dc8ce7817b5d8599013f753098e466a34b5c6823385efd2acd08f4b6a9a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to drive traffic to these sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9629

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 https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1pgumbqkl5q8kpkdncs2outkqo/56009158231.pdf In PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8897d8d2fe---68342216425.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080460487a0a---fesilogawenaloxe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/7vp6mq9ctvmbvduem4teguhnh2/13582990338.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3088191d958cbc8541630b3842b6c252/mizixifibibud.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/mufozowediler.pdfIn PDF document text
    • http://iccarrentals.com/files/file/22583017193.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098b08a1c1de---85493558751.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210620044514.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/sopufovumemaz.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/bevid.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/62535245380.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/95408335077.pdfIn PDF document text
    • https://bio86.net/fichiers/nuliposerinobupapexux.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/burafabajupejikamo.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/lavuwolamogazibemefejaxil.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bac7cac23---3588024176.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cca7850d---62048055282.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062506450173499.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i004e3qhjj8jnqjpdp10o8rk53/89677868303.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mg9vhec6va1m0lf30u7nv335a7/11988020210.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/diretiwitefuveteduxo.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/rifakutugewusumuza.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/50798521671.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/bafebidowefese.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/42838169557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mame+arcade+super+emulator+full+games+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e6da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE6DA 19168 bytes
SHA-256: 18e2e9b1d1de0dab4667568834e34dc9d8fb62bab1b085154675df15257f2d7b
font_00_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 17080 bytes
SHA-256: 47f62edfcff3ecb3c03631fda826e7d0dadc3aca84ce5e65f85656537705f919
font_03_sfnt_off0001331c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331C 10952 bytes
SHA-256: 4898377a4ec3c30ec2a1ec497063209933617da3de31218e0d6bef39d2c73670
font_04_sfnt_off00014c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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