Malicious PDF — malware analysis report

Static analysis result for SHA-256 20280a2e1b43504e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-03 00:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d92d24224d96019d02c6598c6a6f4208 SHA-1: 5b1cad148b5ea4e2fce643b5d7b598e64fbd8796 SHA-256: 20280a2e1b43504e4c804aaf15ae6db5ccb6498b4bcf0486c884d2e4a12a6b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic findings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef0798fd2---sadepenibeko.pdf In PDF document text
    • https://medius.sk/userfiles/file/35880644679.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/fekapelali.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/8d4db968f3a9e4e4c07b35afc4e6893d/71698717357.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc043d5556a---70392053439.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607affa1640e8---xinasatafelexuweno.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/febekonisovaw.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b2174a6f---tuvubesufifatubidedototo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4de99ad7c00445128487a12f360987df/wutitazojimemevaje.pdfIn PDF document text
    • http://superazs.ru/images/news/file/pepaletufo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609148b03b253---tunapizitekaworogas.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a761f2d7424---54814048161.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/46585012128.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/80419991289.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/11886538327.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/jubopibifetilidavof.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/28d6fe23d6826a56f194a87976f85453/debop.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079892f0e8df---51712635545.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/19115155359.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/tesagivaxipekuvetenof.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/82910588927.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/41777472601.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/pulikokejavuzufamunuj.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7s3ehlti905q04mdqvoub8hdr3/81913068473.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c481367062---vosodogagitijirapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=printable+inventory+list+template+pdfPDF 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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 10980 bytes
SHA-256: 23ee1f4bbe2296a47aee1415051de16f611a8500c6b6ea500cb79cf01a018cdf
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 17044 bytes
SHA-256: 4ed1c8e7fc962b22d2ae2a37d26cf80f96798b77704ea7ba8b382d3f3191ce61
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1