Malicious PDF — malware analysis report

Static analysis result for SHA-256 359b25f229734fee…

MALICIOUS

PDF

83.7 KB Created: 2021-08-30 12:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0ed3729990b2c631b756d78ee96ada82 SHA-1: 9a0ea5a21826f235388aa4b94bba4fee655eae13 SHA-256: 359b25f229734fee84f04f6b7b959627330dd9bd9f2f21d0c85ed70caba78af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple disposable domains, suggesting an attempt to leverage SEO poisoning or phishing tactics. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a focus on directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://strahovka66.ru/userfiles/file/nofenekalitematujukujikaz.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jiiqnrki2f53nodjo13jnduqnc/51635642896.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/790408f99ce1c31a7c0ff9b7cc52ab81/32923778446.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gasudosijumaj.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kenojirakinam.pdfIn PDF document text
    • https://luminex.pl/upload/file/86238646008.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/xanozulufofu.pdfIn PDF document text
    • http://jngf.cn/files/file/59874861629.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kemiwozibevizipenulevep.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s21jsmmu5rjr0kqldbi5d5bh5l/kezenedabaxekejomonado.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/84405191980.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/9163766025.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f5uqlnmu8ektbft5d404vvl9vf/fesagi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec0ce62833---bizudegepubevivibaterenit.pdfIn PDF document text
    • http://vivekanandbawwa.com/userfiles/file/mozapizixipusat.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xobuwitizepu.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zekizuvedapo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc78ccdbbb---zazusofav.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/27d21a673cef7b0ead297dabbe4e3a6f/sijajaxo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160833213e56a2---livaxofuma.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/67645169080.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/5991986157.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b6a022aa611fd2265aae22769a2a5974/72632908142.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609458be54190---sevetetivajejudixixix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+floating+bed+in+minecraftPDF 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_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 17744 bytes
SHA-256: 893e06eab88a616a519c4a4a049d200958313515b609a886d4d144dc33179f62
font_01_sfnt_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 10960 bytes
SHA-256: 894cc6a4fab50820ea6bbcfefa78f026b5e8dd418c5c7bdc83b235f263a696d7
font_02_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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