Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42cc57eb7db797c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 02:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56f05ed8289b523de2d815f525b7e25a SHA-1: fbbbc91e86e9d4f95e875504dbac862ed0b6033a SHA-256: e42cc57eb7db797c75922fe3fe74ccb5d8d2ce0fb886def3af9b3b580aa3b9d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ripedzn.com/app/webroot/files/fckeditor/file/sugizexitupobetumiludut.pdf In PDF document text
    • https://digireg.it/upload/67696151995.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/90dfe6cd668420bf6e75c73526b261f6/91974781413.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/45b57ad6a8bc8248a77853c65cc29339/31674752284.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/sazokag.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/dulufamekok.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/46933653757.pdfIn PDF document text
    • http://espwireless.net/uploads/file/49914974225.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/tozoruvekez.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/bewusedawejukexijekedunez.pdfIn PDF document text
    • http://puisan.ru/uploads/file/pusomodu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/jijojisonarotofu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630778858napepuxetutotox.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/zojetadakomata.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ce9dp27ngjvdifkkorbb0md86l/rofonodakodoj.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/zufuwuxaxopexanajukeruv.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/rarenibitevusuga.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b99d2def63---68939707645.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/72260912454.pdfIn PDF document text
    • http://schokozentrale.de/idata/zimisigezanuwegej.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613726e416557---99918028989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=aplikasi+baca+novel+di+iphonePDF 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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 16188 bytes
SHA-256: ba171bfd742995d6443c6232dd4370a8fc7f7192b439001b3474c4ce91f8eaee
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 10692 bytes
SHA-256: 5a475eb1e2020455f613446dbee9f9cc4f0ce270186aef3255e5c46ab30bfff0
font_02_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1