Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab9ce80e9653b47…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 07:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 263e6a7815b76c63100d16a868d3623b SHA-1: 83e6c7a6f05fa9c382c9de704724238d4da81274 SHA-256: bab9ce80e9653b476bd97151def392a8b49d542a4316037bf2611999c894aa3b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The primary attack pattern observed is the use of a link farm within a PDF document to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://eurekaelearning.com/upload/news/file/bisuwege.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ea1517e1---24922898450.pdf
    • https://renetravel.ro/images/files/2344184910.pdf
    • http://coimbrasoftware.hu/images/uploads/files/347520793.pdf
    • http://msamerica.net/clients/873634/File/47210169926.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/3f1f15609b2efa02bb4a82c0cbe00c15/28393426622.pdf
    • http://doyen.cc/images/upload/File/povumowegaparelowiwi.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/fedazo.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/657194c1dc8414be388a2a92914bf508/nogewezabanedevewozo.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/34493734170.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/tozezodupoxadagi.pdf
    • http://studiofantino.it/userfiles/files/vipegejetujipabo.pdf
    • https://calmoinc.com/upload/editor/file/guvulebebepimagugumep.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d3b0985b41d5da9c9036b3b47c011856/tukurike.pdf
    • http://studiogaleazzo.eu/userfiles/files/tetemafigelizuke.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f5233278---javavija.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58db7e800d---xaxebolimirutujibamopaxej.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cv1gbk6oi8rn93fmbjb7bi72jn/sasidoferuforufopi.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f1679dc5---nugoxedarar.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/d9chbnkvjrii57hef9mssseade/wowemokofofigilonipeparo.pdf
    • https://decoveinvestment.com/userfiles/file/76228352908.pdf
    • https://pearproperties.in/userfiles/file/39674672304.pdf
    • https://alzubidi.com/userfiles/files/lelej.pdf
    • http://szwygs.com/upload/murilejulezubodipowura.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8382f6689923668597fd3681fb82ac91/91716826660.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=noble+gas+configuration+for+mercury
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f213.bin
7a9eb94ae830c09d1eb1580096b110a4d4960484617ab0906065c7a06f077229
pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 11008 bytes
font_01_sfnt_off00010bbd.bin
efb30d646f1e64d8b40f3b817e3c9def505a39dd41a364218ecab95b341ca8d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 18376 bytes
font_02_sfnt_off00013cd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD8 16792 bytes