Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e10f171c82dceb8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 05:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eed7f29211a3f50dc9839883e30da750 SHA-1: d5be767335c3321fe09caee865b7302cc1810bf3 SHA-256: 6e10f171c82dceb84f397afd43a06e3a53a1bcaaaaf26ce8344029b51205d8bd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are likely compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate an attempt to lure users into potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://777mto.org/contents/files/83344746215.pdf In PDF document text
    • http://danhsach.hagigroup.work/data/media/files/pelufesamiz.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/23039929454.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/54515987418.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9bba15873360c0a822dfcc5cfca44b42/61155289610.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/lepimi.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/43344693196.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/96844377011.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/76032539436.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/fijonawiwup.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/vudikolavixonaveta.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/nifubo.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/76864373640.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vipizu.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/63727025726.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/sanejovinolos.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/wolorulimazar.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613877ef68996---vegogukabamenajefej.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/67520448939.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210908_EFFA8DFFCC219CCA.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a960e30477f88541422c2bb5883817c1/61945020992.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/30350555621.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/62727883805.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312692bffab---66093134359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+5+mobile+for+android+%26+iosPDF 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_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 10660 bytes
SHA-256: 37b3849a89d38e480e58cb54447c738ca4847503f5ecbf1f43aabb8cbe3c3654
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 18716 bytes
SHA-256: 87cc862007d8b22ba3ec244c8c422d2a641b1825caca5550729b9f6d4e53d355
font_02_sfnt_off00012b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1