Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc439291e6bede0b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-14 05:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4d65f0343b8bb58adc056c44e18e11cf SHA-1: 3c209b4fac11867a9376dd1a39eed204ffddb048 SHA-256: bc439291e6bede0b5ed6d1836e80a8318c10f02d193ccbf5aa9417f7a619c9d8
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of a 'Download' button lure further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bem-sa.com/img/file/65786512108.pdf In PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/rujamomanezixelowub.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9fb9bd5d35a863431a1dd1a51862127c/mubexuwiwuxuse.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081a522c18d0---87350316372.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/rerafos.pdfIn PDF document text
    • http://firegallery.ru/img/upload/mijujatusanuvigafovexelux.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/84282647168.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/72665249198.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1376e72da---70220889496.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d7368aed9c50e4c0a8619e69b9768c93/demamibodiwasatejulin.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/repagisiraregedezitajori.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/86982211113.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b59701bf52d329b48744166528aba0e1/8947360316.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/67192605991.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/pagixopew.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ml57tj4k90r62f854h3srshit3/petotugi.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/punasixadobiwawifijevox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=new+movies+download+in+moviesdaPDF 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_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 10340 bytes
SHA-256: 88a97f41a01a95d0ff6cba173c056a86a6db08b7fcb0169fc5a48bc5b8d0e81e
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 16912 bytes
SHA-256: 0b057b02831958a143f330c9d5f52aac5089adafb0c8e8b41561857a65d3e461
font_02_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1