Malicious PDF — malware analysis report

Static analysis result for SHA-256 126019bf47ab3624…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 13:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bcf2d9ddfcb53d74a6ef0ade11b9558 SHA-1: a92ae060759ad3ea7c2e79d103367fd31fa603bf SHA-256: 126019bf47ab3624bcf0ea66d8bf4c32d6cdbaded854b46d2866fe6cd33316b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for embedding malicious JavaScript or exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f75fdbd9c88a6bb7bb583586e87e3667/gosesejoxudazalakugowedog.pdf In PDF document text
    • http://3sdent.com/upload/files/pivinusirosut.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/xoruwuvibajipobeguvoragof.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/68829348806.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/51cd335546d7360c5d2007c794fcd0ef/lobig.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/nifevonerozetoxoputop.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/ruselaju.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3da8bf01a---77608413121.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0c30e1b87---sukugaretanozija.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160945c540ab23---30641731908.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/vamajovaju.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ae3ikfs89jv05ei0oll741vf88/zarewimigugilodedidizunu.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/lekalosezukajewivo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade7017c812---faromisa.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/35125267950.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a8e414c6c6fdb24308871221dd79230f/wedukejutonuta.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/29d46a6b05758a6f31498557bf67c8dc/9855423625.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/xisegazagasedewasa.pdfIn PDF document text
    • https://agermag.ro/mm/file/gutokobutuloxejetosoxo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6f8d4457---80510436404.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/subutavixad.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e524c16ea---68376976750.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/69757183737.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0aea4322---suwekozagufozevuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dominique+sachse+salaryPDF 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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 10756 bytes
SHA-256: 9b1d4c1e5d54a974b4c5add85731430bc979e79eb67dd54249bc24148cde4e59
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 19236 bytes
SHA-256: 36138b99c6b9640e1a175d0b60e3b04411d4c3036925713114f9706ebca8c028
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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