Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b66be188ed7a07…

MALICIOUS

PDF

98.6 KB Created: 2021-07-30 21:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 329967f5ca97619b9fd3aa2e23fbd9fc SHA-1: 4d4ed69461d9a57973ece08f4d84f09ce19b745d SHA-256: 20b66be188ed7a0781ef19c9e310072c7092e57a2b33e978584cdf0267cf5c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=organic+chemistry+reactions+summary+pdf
    • http://ats-dz.com/userfiles/file/sujozixogijo.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608640ea7770f---sixitowexuniwosimewezaba.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lakmv0fb2idmgi828p5loup035/berolidivozor.pdf
    • http://juentai.com/userfiles/files/97306093997.pdf
    • http://emannsltd.com/userfiles/64476865406.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c28f2b97b5c---gomezaxof.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160acf293c5f3e---kelolagano.pdf
    • https://banderlogclub.ru/Files/file/32767708319.pdf
    • http://archissimo.eu/userfiles/files/tojerowefotisomoxejuti.pdf
    • http://bajajsports.com/userfiles/file/81053347810.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2adc0ac19c---19272205174.pdf
    • http://straub-online.ch/userfiles/files/detosojutibenuditesuru.pdf
    • http://transchem-tech.com/Uploadfiles/files/sadij.pdf
    • https://aronabritcan.com/userfiles/file/32717835436.pdf
    • https://silky.ae/images/bulk_images/files/dekudixevifaburugotuzaban.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1076a8f5a5---fupexusesegomiput.pdf
    • https://surupaceanu.ro/ckfinder/userfiles/files/6702531372.pdf
    • https://open-call.fr/uploaded/files/68826675363.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/31191393630.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7da2a979d9bfa30b8fc7730d7db91515/66226085260.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71867484863.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/acb3c574d6cf8978a4ca16c4bb615444/kuwafadomidixulufo.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c8ca4e6d---mojafenumalafegajebugaxug.pdf
    • https://sieuviet.net/webroot/img/files/pegivupejefed.pdf
    • http://gd-weimi.com/upfolder/e/files/20210530010644.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118d2.bin
108b32ba82d59438a38118c26733b6c375f9dae49165065ebeb1b2e3509db505
pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 11260 bytes
font_01_sfnt_off000132f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 16792 bytes
font_02_sfnt_off00014b05.bin
64575402f7c42f45500441c4fe8c41d9394ccae4956f3f70d3d29e0bc4849378
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B05 18356 bytes