Malicious PDF — malware analysis report

Static analysis result for SHA-256 0057dae11c02b913…

MALICIOUS

PDF

76.5 KB Created: 2021-08-31 00:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5621a1296d38fe389e935267c7a4017d SHA-1: a1db06f14a6045d486be320ee1df4d2f7f2e035b SHA-256: 0057dae11c02b91385b1d20c8730bbd0ec27728a4ce9708686677daf077b080f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely contains instructions to decrypt or access a password-protected payload. The numerous links to compromised CMS uploads and disposable hosting suggest a link farm designed to distribute malicious content, likely an archive requiring a password provided within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0050b062---9044263058.pdf In PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/mumududepagirepidag.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/971aaef061281364fedb4101a63fbe8d/gutibobasupunusilarakuxu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc1698f9b---weriwate.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/mubamapubegoba.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7eae0c39b287e6705557a2e8e1be1fe7/sukiwavofimiji.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cef4f1716568bff5cba123393e09fc58/21746544483.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824c2431e0d---70537245037.pdfIn PDF document text
    • http://0048.pl/48files/file/pulerirexezebet.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16107ead0db130---dizutajetewesowalazabut.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/20970748512.pdfIn PDF document text
    • https://promise-land.com/upload/file/48679286657.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tadujipekarisivufokivi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/65327190091.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609740bb86b83---fevafezimupozugox.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5d7038f2d87a57ae52682348d7c1fe68/39908554686.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/fixaxituxaruka.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/25d2181f22b4757ac2b6b5416e21dcbf/denoketupenitumij.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xaviwuxofisobowejupa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/asiub9ak96oes9djmkascdjc21/mubumoxojopevaw.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9d0c12695---dezawuzuru.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pozidefojivonaregawir.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/69285697625.pdfIn PDF document text
    • https://tonitomov.com/picture/file/15813789030.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/50522939408.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/26922868362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=good+morning+sweet+message+for+ldr+boyfriendPDF 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_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 15884 bytes
SHA-256: e872ea4b114f633e3642cdbef7096fabd807d1429e17d87bcfd4f0b9372b66a7
font_01_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 11076 bytes
SHA-256: 9f46239ce11d851e41b36ef96e7afc76ccd3de480b9dee09b7e9b6ef056ce75b