Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23a01ed4b783951…

MALICIOUS

PDF

96.9 KB Created: 2021-08-02 13:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 126d9231814f903a834721d78a0a5bc6 SHA-1: 57aba5467cca301e730d73ca4fc0a18f08748dd6 SHA-256: c23a01ed4b7839519f1683cf574838aeff1ac6e0e777136b350ae5db50e2e376
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sirmamedia.com/ckfinder/userfiles/files/39586887346.pdf In PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210725_AF390934D6FD3568.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100e0fdcdee2---89654641002.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/107913164b14c399891327b71eaaa921/livugok.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/19908779484.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/94607177824.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/nijaxifipedovuturav.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608817989cb1b---kotozewizudu.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/32331702605.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160e49cc98d2b4---fotejadalek.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7474632da---38721338330.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea15fa8d25---sadavanuletebosap.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/64781086459.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/38756072755.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/sufekikipidi.pdfIn PDF document text
    • http://sgpeo.pl/users//file/8979289923.pdfIn PDF document text
    • http://ranagro.com/files/48307206720.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3daab9823b1ea6f269d25101314ba966/39528018427.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c1b60bec6b24a5118b21f3c8daf9fb47/mumoledamuxeposelogomuviv.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210625_A168A8E8064DB2C8.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/50070650520.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/18729274532.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/98510690598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=recommendation+letter+for+student+from+employerPDF 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_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 11040 bytes
SHA-256: 38e0e828ac26785e30e318dcac1780f2bad32f81a462e26c274d7f2ce989d1b2
font_01_sfnt_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 16572 bytes
SHA-256: 27bbc681d78024572f2aab4858e094f83e1012cd68f3d486c9c4e35caadf6f55
font_02_sfnt_off00015d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.