Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5184bc00c44c7da…

MALICIOUS

PDF

93.7 KB Created: 2021-09-03 06:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69fad7a8449610fd11ed78688d27c51d SHA-1: 55124bef8f44d7e4616220b0e0c0cffc2a820a65 SHA-256: a5184bc00c44c7dafbfbba9f43164d5d3b884d3b62c2d877286397810e0c77eb
124 Risk Score

Malware Insights

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

The file is detected as a PDF phishing trojan by ClamAV. Static analysis reveals it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=tecnicas+de+neutralizacion+pdf PDF link annotation
    • http://jdjcnc.com/upfolder/e/files/20210825052432.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/82dd3a0196b467c20a19203ccd1e0e4a/jirasakudoleguf.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b9f57754a3cab8087d89a5c8084776bd/86561662214.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210826202142.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7faedf23f---63638361908.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lugeburarugudil.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/8102352126.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/jegunomugikonotovekon.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/50563784a46c9b237db2bb37b76b2bc3/tasinitegoseto.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/75646370499.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23d2b6c51d---4316881724.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/xexawa.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ef15138bc5fec3956f9b942a5150e11f/95198972257.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/kefezotugowuni.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c694a18baec---61912482107.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/95785287927.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021825_111052_845.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/39391205922.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/bunipap.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/36c5f366fc31f9c008e58eb4a65aa028/9310094591.pdfIn PDF document text
    • https://afayl.com/userfiles/file/tilomemetekokujupuv.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fccd93d18e9126c8c657a10af3a7b3c/rexate.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/zumexalatoxujedupat.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001370b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 10736 bytes
SHA-256: 6cf71a6773bdd25dbc44afb896bd6d5976fd972083d3d62beca3e63498f78100
font_01_sfnt_off00014fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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