Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbc11cc042f5b9b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 06:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39310b1aa95858ef46e124233e3a1ba5 SHA-1: 1d32e36b1aef538a8e16462fade71567252a9a34 SHA-256: 3fbc11cc042f5b9bb827670e931bd9b682f03ceb624d75270a140e48d6cd86b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final destination. The primary purpose appears to be directing users through a series of redirects, likely to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cdseoulps.com/uploadfile/fckeditor/file/vudufatufa.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5d916bd3---gokedituzosugivukuwanux.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/33111298017.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vupaxuvos.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f901b2eaa---16980635962.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/xobabigakuvitazimitediwo.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/fonobuvanavogipinefuwolov.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/56515902407.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n43ol6irudm52tleg1och3uvqt/matar.pdfIn PDF document text
    • http://sun-tes.ru/files/file/bijujusepeberezufug.pdfIn PDF document text
    • https://hirurgija.me//files/kakevobazakufup.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5580af7b---zofitarixujasadem.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cf56bdb70efea85592dcb1f5f5ea62b5/69535405860.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/nofasuwelurujotokifok.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6018840f---xejam.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/ripiwuvogazedepavuwupenuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/h4cdjg2vn7fsirrps9c0bfl956/63873318527.pdfIn PDF document text
    • https://mbbs.hr/files/71189655053.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/welabametakamotalukal.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/nebesera.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/50417699879.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/44055034669.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/92866eca1debd57d8d1f3d251cb2e027/mixabamuxuri.pdfIn PDF document text
    • http://shesob.com/file/files/34984399470.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/11329862718.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238db212dfb---semalurinodixaxumirefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cara+convert+jpg+ke+pdf+gratisPDF 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_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 17224 bytes
SHA-256: 665316f36c88e7c2889740dfab48197b60993a0e93238810552555a2b9824be3
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 11068 bytes
SHA-256: 70fd3b3c7f77d520c6d28b01b9482b80dcf7435ce24e21e491f142e2f491fd3c

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