Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aa5334b4e7032c…

MALICIOUS

PDF

95.9 KB Created: 2021-07-01 16:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 444d4e39879445cec1c0f2733c32a2b2 SHA-1: c8bff87ee4fc57a4c325378243722c5346c55bbf SHA-256: b5aa5334b4e7032c652aa47867ec0e33501577e99234658e38625cd8f0d415c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure itself does not contain readable content, but the heuristics indicate a deliberate attempt to host external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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://e-kva.ru/admin/ckfinder/userfiles/files/94132323007.pdf In PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210615041949.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/bf5iathjvth66vcs179p4qvhg9/21123448451.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/pekiwutujawokija.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d11661b91c---24603153393.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/runixavibomudavotofilupij.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/sebujetapanubojetekunufof.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/93794978801.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d80db772da---gitafanokedagulizi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8442d2b03---10714133658.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/209f2a74b9764637ca8bb9f29ad0a631/18320864900.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/48966682113.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/55441924437.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kipogatifejabuso.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/feregejajaja.pdfIn PDF document text
    • http://www.emailposte.com/pictures/fovelakuxizafiko.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e262d779---sexomi.pdfIn PDF document text
    • http://khotelmarket.com/FileData/ckfinder/files/20210630_F9915134AAC9F078.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a2cd3a688---joseput.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/22764627785.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/winosukebotexiguwagog.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/7720953935.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/rosujusa.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5oltrj809ll4ki1s5jhq0ra3ac/34051425803.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/463560ccf3d764f4fe7d71349dc554a4/gulifiv.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b3de3559f99e90c7d46c6945bd3cbf02/mopokekujawolajilaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chipolatas+wrapped+in+baconPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 2192 bytes
SHA-256: 165934587a3a67a097aaf10d4f8a08ad7d614e541a8dfa34d33f40b7071e8cc2
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 10868 bytes
SHA-256: 5a47e69b1106981262348a190095044cfe83817f434bf0b002f9a7c78214cae1
font_04_sfnt_off00013f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F93 19472 bytes
SHA-256: e34a9fc78c5df3707af6bfc83ff667c97324a23fb9744d455d2e5f8f2dcd3e7e

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