Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa800d90f46e71b5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 04:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e0644e76a85e9c04a48c7647be8ad7f SHA-1: b5582c33b3ffccf0dff40406bd052cbf6f28e161 SHA-256: aa800d90f46e71b5ff5c5737416c47792765acb2b3701ac39f4a9426d4014c2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://kvbm.org/pds/userfiles/files/dufesuvobi.pdf In PDF document text
    • http://learningkey.org/userfiles/96636309253.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f46cac70---38725043480.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/bawef.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/62034841061.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/sivajerenegukaboperewava.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/gexujenetamamovujinituk.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ee4eefb0ccc3803573158e165333a8d9/munezematorisovo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/meporez.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607685eb3086f---3055659683.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/97809f5682db76fb1de3a77e386b9dfe/76149077553.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/12204922955.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0dac900dc---47709085494.pdfIn PDF document text
    • https://activepymes.com/pub/file/rupiv.pdfIn PDF document text
    • https://norservis.info/files/files/pivipurejisolizavufomuvi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/167006d8dd124044c9a8d00be4b1a20b/42818942535.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/19843549090.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aafc33974---zutozimakumujatuzuma.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/60594772708.pdfIn PDF document text
    • http://ligneus.hu/upload/file/dotonuwawerapomekewagerok.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/21767787079.pdfIn PDF document text
    • https://dm288.rs/slicice/file/64544436098.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/90304163398.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f48c2aef---22648422895.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/l8fr6kdnhi0d68drgl0nt8o0ki/48299706135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hollow+knight+wanderer%27s+journal+pdf+downloadPDF 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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 16768 bytes
SHA-256: 98c2976ff6311b260b21b3c5ba163daa8cacdf6869857387a991a07bb3b4ab82
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 11212 bytes
SHA-256: 2f7112bf4bc346ad82dc19433576a491bd9dba28b62097584daf8d92f93921b2