Malicious PDF — malware analysis report

Static analysis result for SHA-256 477d4cd10e95a6fd…

MALICIOUS

PDF

85.0 KB Created: 2021-07-15 12:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c3d2c135d979bdb0f9b5c78505523c7 SHA-1: 3de27d4a2d449c0552912cbc0ff50daabaabed61 SHA-256: 477d4cd10e95a6fd583ebc9e08b4b5c18ab4f228ef7465f58b3bdbaca5b9f792
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to distribute further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://archism.ru/uplcv?utm_term=thermal+conductivity+of+gases+pdf PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6oa9b76llmgsljkefmkpv8so16/nepirafanu.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zeruzapotiruvejer.pdfIn PDF document text
    • http://euro-ex.com/27363475147.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e8a74aae---jileluxofatol.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/69477543926.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/92898060233.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6269c93f50e4b9392e9a55e1a52acedc/37127058958.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7940857bd3---wejobumobarade.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/97a33e98fae0a3198cda192efcb0422b/vunozexozesojo.pdfIn PDF document text
    • http://tfforming.ru/d/files/botodojegefiket.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/4rlas8eg0bnq3cu99mgs4ca6av/xobadeneruvugevobekilu.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rifuzibaporizidonewewavos.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/69736085555.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/k77t2bfjlt4b24ra2eq3dedsdn/19292652736.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/gosofotiwopopilinonumisaf.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vatutimopigufiturexafiba.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/59083711837.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b529c8f2a84---54190414294.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16072590156510---tetomifuxalakodexirel.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/tolafawimaxonebufa.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/sadizedikakowupomilejula.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ed6c03da8d7d37030ae0820d5fda0568/13630905095.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099153bc9263---32728088686.pdfIn PDF document text
    • http://nakatka.com/files/file/renasozafozunulem.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9bbb7ab74---3562249517.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/62504d7361d6960075b06144c0888013/87558670890.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_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 11312 bytes
SHA-256: 991b340d69a4b2e399a33f96fa74d8daaa55d90bf68c427f58cb51307b38cb47
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 17644 bytes
SHA-256: f2f8e42671ae84affbc24f44a8de7b156a04c00ec3c5a86a4fa76b7ce6dfa970

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