Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d799614ead59a2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 02:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a71e80bf70cfac768756f4d8b33b0ec SHA-1: 5ee54b4e46509302f0a5d071efa887028db574c7 SHA-256: b9d799614ead59a2baa1e8fca401885f03744f9669447ac06e5372d5f5f57588
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of JavaScript indicates an attempt to execute code within the PDF, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=farewell+my+queen+full+movie+online PDF link annotation
    • http://eros-arena.name/eros/userfiles/file/92171419181.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/59517465508.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4e765ab9ad0b640a1e2b0f08ae448958/rupup.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/88494935759.pdfIn PDF document text
    • https://businesslife.com/content/files/92246802197.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tudasanidojunoneke.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94765348664.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/72148858678.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/18586464555.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/wipixozege.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/67235722602.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/43056579044.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/33914897137.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/26891336768.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mimisopeximufinarorux.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/51890659667.pdfIn PDF document text
    • http://asustainable.com/global/file/47787384881.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/hsuanij6l258o9nqp5j29bem05/xupepefudupaso.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139968917b0f---71147100645.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/lubivufo.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/68232138490.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/23157611737.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/lidulopaparewaxifidi.pdfIn PDF document text
    • 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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 17496 bytes
SHA-256: 210f136a9c5c0119f1e21745c90602de9afb878ea80b6bc0878b64788d209a9d
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10596 bytes
SHA-256: 9d99e33b20dd948df4ca3d54ec0dd15ad56456f010af06737328419ece14ff5e

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