Malicious PDF — malware analysis report

Static analysis result for SHA-256 da39a8104247b963…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 02:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 884268145229f90554397c9c73d684c0 SHA-1: e03c4a55b29ea90cbc734a23b9a16a90e59e0b79 SHA-256: da39a8104247b963175c66c652c41c35d45f8300ff8d8e69a03070b9aa49830f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories. The presence of numerous links and the use of compromised hosting suggest an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://aiswaryamatrimonials.com/fck_uploads/file/49595827708.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/dixuziwiguleb.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16110300e772d9---19020704569.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/55390038653.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210823_B58F4E380F8795D6.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bb5d9fbd864a6c71748638d63afd6570/mubokipevaliboxopa.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/80011393364.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/86160714958.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c8d8a87a---69514932998.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/76963342349.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/14638843731.pdfIn PDF document text
    • https://ntc-container.com/upload/files/88827002680.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd712e46be---88405701517.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c0c25e9cfbe5c60e9eebf7cad1fa6b6f/72042568222.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/pedaxazenaxifagaz.pdfIn PDF document text
    • http://esistore.be/userfiles/file/10239816639.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b79715a2c---xolepijiref.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/81747023857.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/4404e59ff0b5359ca631076a94f2e2ce/kudamivujovet.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/sidorirerewozevegomabotif.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/tewowidesekuroga.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/73720028424.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/peguporomokukuzad.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/53446421055.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/jorusuzim.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b746e14990---71133404714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cdr+to+jpg+i+love+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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 10464 bytes
SHA-256: bd157cb41d720fa03ad69181301f751ae991b5057a88100dd33566797f835c92
font_01_sfnt_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 18044 bytes
SHA-256: 0832c9061977e33313396a3405a8048582add703123232a6d909615e008c6ef3

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