Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05b66b4e35508b8…

MALICIOUS

PDF

94.3 KB Created: 2021-09-03 03:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 274a3948a65651e6ee8f5693a384b793 SHA-1: ac333ec9d4a067c7f1d9fd910bcf22035e3265a3 SHA-256: b05b66b4e35508b8438ffbf31db60b7f8df0683655bbe4b77ea6089580a71be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://cncunse.com/d/files/damemimamapez.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///202172204278069.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/de42aaf05027a5984a681274b5edbd8e/13521476091.pdfIn PDF document text
    • http://abwrva.com/uploads/files/ligurobijaluzujebapisedos.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/pokuvodujezasibubuz.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/31031396200.pdfIn PDF document text
    • http://kotolantopeni.cz/file/81735558989.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/08/20/11197455767.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/p1l7b8msl1rf7s08shspitt0ln/20016599693.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/72111975673.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918cba92845---23844812731.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160707dc07af36---45352278030.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/zukukirikavud.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/boxawapalikuwegimenavow.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/fonivodiduduwemivapupi.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/27768375128.pdfIn PDF document text
    • http://imi.vc/upload/files/rokaviros.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05e3af38e0---femimujamebegovodo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1b696ba0b66b0c156ed523fcf210c8cf/92812224582.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sqv2l7u5ermvphoq3f8gvi5ps2/zefaronelabubakipol.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/2t1rrhk2gdothgl69fq3m3d3k7/pakurubo.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/namije.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c27477a6eb98d89bb0e842d329e71d30/92597054826.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/cd44847ea51f7095322721e18422eeb0/30181773026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=constitution+of+pakistan+1962+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 10944 bytes
SHA-256: dc3f9889dc8ab68219d5da9b377d4b465ee7611b5f2198bd2384bc9ec63d86e4
font_03_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 17964 bytes
SHA-256: 430c8afc71acb9241e79f5b425d19542f86a2f5eb637736ae04ce4cc788e1d55