Malicious PDF — malware analysis report

Static analysis result for SHA-256 581a6b397028a523…

MALICIOUS

PDF

269.8 KB Created: 2021-07-01 09:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1230b049e7dad899f80978462775b252 SHA-1: 58fd16804743a3565e193cc97e66811e91b98bae SHA-256: 581a6b397028a52303a5ebb946f7dab0e0e3ba5b87081a059de6b565cd5cbad2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the use of compromised WordPress sites for hosting malicious content, with numerous URLs extracted from the document body. The presence of 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'SE_LOLBIN_RUN_COMMAND' heuristics further supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9728

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=cote+at+home+refer+a+friend
    • http://sooclose.eu/upload/File/40248286845.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607692460c139---91307716436.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262781b2d8---tewapi.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608891e542c40---23118597999.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hk9l75keegpcmdtq6ji5005ov6/44033939716.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a805f73f106---42633388623.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7e083bf4a5f7621a04ac40eb321a1ddb/30303681586.pdf
    • http://dynamic1984.com/user_file/file/kusuvaruzug.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4f3b898b9192f72ff5b41c90aa49506a/84733449638.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/26533577601.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0026a2f8---xaxepidigat.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f2a96dc4a---debopozezebijufezijipaz.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/1ebb4cdf663c2789dd284e0e48507851/15715375786.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607513ce7c08e---gobozuwosodal.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2686df871---83440207169.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0b9ae65970cf263892ca149eee563c35/wodaweg.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5d607dc0d4acb37d0d2f0c67e366003b/78817232349.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3831c81b---37406847575.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ad77857971e2b9cdf72a62da270f68ef/41104456963.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a607f5ce529---98405138356.pdf
    • http://mazdooradda.com/userfiles/file/jusujivikoxapujozajuduxe.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66ddb792---jelikigubawele.pdf
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/dagetikavefazopajatoxu.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a61e614cf---26804390693.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73ee997f7---85299010139.pdf
    • https://tiklatakip.com/calisma2/files/uploads/99461679616.pdf
    • https://smarttactic.ro/wp-co
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d575209bec2809d4c1bfc5f4d094d01c/78578161666.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003bf97.bin
9b7b094eef5e9d90ee5ffe2243ffef1dd60c30d6d8c9022eb8adbf40ff895d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3BF97 10436 bytes
font_01_sfnt_off0003d70f.bin
689cdea107bd28eb2fe3c930b1cf8813115ba14a1b0e54e0a7df0308728115a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3D70F 22100 bytes
font_02_sfnt_off00041055.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41055 16792 bytes

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