Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0de95bcb36536e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 00:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c73b2c5c32a107d894b052bb48608a7 SHA-1: 5ebc9d56118421284f16e142d8988160a1a2b664 SHA-256: 6b0de95bcb36536ebbfd8d00f892b6caa3ddf0983e3d3b908cc749ce82b164da
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=graphing+linear+equations+in+two+variables+worksheet+pdf PDF link annotation
    • https://thisissati.com/userfiles/files/7387259902.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/reribojan.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/49357473201.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af89f36dcdc---74868876162.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dd5ee103e250cf4a018abf9f62b265a7/jelusunipumaruve.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/78471860777.pdfIn PDF document text
    • https://bauarch.bg/files/70052644092.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/sizatubufajaj.pdfIn PDF document text
    • http://capital96.com/userfiles/file/moxaxezoxuparagogugejevo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35d87e54b---xixojogitipilanadedep.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c1df51107b79054bd1d60099943b2685/7620714558.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/63820697014.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/fapobivez.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/8144761581.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/66307843119.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610670e931d6e---firojud.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/sivejalopaboka.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/datetuziki.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/db8d32d34c0ddfdda5435d308fbcfcaa/ribame.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160989e62728ed---36165265841.pdfIn PDF document text
    • http://cascad-trans.ru/files/dadewal.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tefofil.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xobagaduvadobijagadije.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_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 17664 bytes
SHA-256: 8cd3ebb84c1759eaeff9d06000590c7690c150b3e8fd0ce91d2e42e910815aec
font_01_sfnt_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 11444 bytes
SHA-256: 224cef5a6d85eec954d047762dc867a788f3dca896ec7db0bb9d70868e2faa03
font_02_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1