Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03cfbe4faf6cb33…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 03:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d093de6c81387b94826f7d374bd897e SHA-1: 91cd08f67df992d4b425c865660e26abba36d9c2 SHA-256: b03cfbe4faf6cb3308221375fc3e3f1bbb4987bb2ca60a295f17a46f97504f8a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These URLs are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=how+to+recover+lost+contacts+in+android+phone PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ne9vlm2h00lrmoopsu3d84eecf/wuvebokotozodeviremuvoxi.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jilokupivavesog.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/tetiwakosimoxojuxawiduru.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/kuvoki.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/83691072230.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/da6690d0d8a59e22878c66a373f34bcc/xubuduf.pdfIn PDF document text
    • https://conrays.ru/f/data/wovulaboz.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/gibodavamugatonirisebez.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/86125379812.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/53679998847.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba85621e78---12671495996.pdfIn PDF document text
    • http://marymo.ru/uploads/files/10514501847.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/97444014352.pdfIn PDF document text
    • http://afro-safari.com/upload/files/42321564859.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/020748511827.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/8682569820.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/xomixaxugela.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210922163250.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/xemotoli.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/xuwoguzon.pdfIn PDF document text
    • 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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 10756 bytes
SHA-256: 6ef7299b7b561e05ed19cfe3f604cf5c78b3403fc8f897b6e7cef9e982fd5980
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16708 bytes
SHA-256: f5b5fa16e37d5ba5de74b5415c26ca21e09e66ec348c6ccb9c3bc9a3fe05b56e
font_02_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1