Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba86ae98678873b6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 21:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1ee9853452b0aff6bc24346b3d58cdb2 SHA-1: 4ca0868e44b2320d4249646b96ac584275eb1083 SHA-256: ba86ae98678873b6634630012671e3844628804526260945de461fd32a7a3661
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting. The primary goal appears to be directing users to external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7100e598f---23078764785.pdf In PDF document text
    • http://orenprom.com/img/account/file/70106335401.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/10712648436.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/71795812883.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcbb2c5602---kifov.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/52347473445.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/jobawazin.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/joderarejepenage.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/2636592419.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/25920828826.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/31173787285.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/32662630374.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/70577453245.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/wufetinuj.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/20365334306.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/manukiwefozavebulupimewa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0deb774f---12383010791.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109131215592751.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/dategi.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/82672940542.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614f22a82e3d1---zujirasijimugu.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/bixogetifapinakinekuga.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/vebopepi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/bomeduroneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=epic+of+gilgamesh+full+text+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_off0000b72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72F 11048 bytes
SHA-256: 3ccd4b0ee56159ba98d16d5b6c262850c7c589e29943f8e369c627007a1f8a1b
font_01_sfnt_off0000d0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C1 17944 bytes
SHA-256: ce761c1c7a607651de6063559f319e2947b1eedd62f7bb4c3965541e9cf237dc
font_02_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1