Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67d4682ca61c5c4…

MALICIOUS

PDF

96.4 KB Created: 2021-09-15 20:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fca264d6b29029f49a5a3949a322c4e SHA-1: 8b00e9ca2a2520133e29bf7f3ceebf26d61ed7cb SHA-256: d67d4682ca61c5c4a87adcc5266849ad2991a9fbd853f7de05b5d9f06f747740
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://criminisiepartners.it/userfiles/files/60899554611.pdf In PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/bepemotezuda.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/52f582b6d9616cf54912efe274aa7e6c/witivuzoku.pdfIn PDF document text
    • http://netart.hu/userfiles/file/48829731039.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/57200632960.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161327b868ea05---kigerum.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef5c64e75---kifibesakigitide.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/mijunibafesasuminujij.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/22820371165.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/73793550516.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/72567298618.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/22341121455.pdfIn PDF document text
    • https://halead.com/uploadfile/1631346270.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0a8fb6c1374170284efb81a392261566/44601188627.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/8645647136.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/81965101239.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/pilox.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/8552274369.pdfIn PDF document text
    • https://fuoriscena.eu/file/bifexuzig.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b5b233c7b---54358343980.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/mepogepuzasifiwov.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/59318277821.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vubolejefupodunop.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/nijazitogelujabigakewure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=throne+of+glass+crown+of+midnight+pdfPDF 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_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 18884 bytes
SHA-256: 8022be527a1ecbd466abd2043d7256b3a74a3cd2b0755d3e7170da48216c54fb
font_01_sfnt_off000141a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A2 11116 bytes
SHA-256: 48ad24af4fddc78055d14383ce93dbf095d6d70d9e9df9119d11382eed2e7598
font_02_sfnt_off00015b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1