Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a1a96da0b7f3c7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-07 00:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2901c4c2b4c5ff2dafcd82c2e43c50d7 SHA-1: 02f40101a1fa16ae662b546087bf44fd7000cd8c SHA-256: c1a1a96da0b7f3c7330ddaca2ab56c84013656302e23659dc827d685d7dcfaaa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on disposable hosting and compromised CMS upload storage suggests a tactic to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aebe65a9---79644651362.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/cgmb8nkq41eslcbv21jjq2e6v3/punubavojuzeg.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/tafugofudesikoguzekiri.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/64lnc8ib66rkn88fscqgntlfe0/maluze.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wepumelu.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/gageganujovakifu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e499aedd8b---jowosuxadefewaz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e24740a01---99322077621.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/dbc00e40e33512dc9f1e222036bcaeb8/nirozomew.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/47012164476.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99442a1c90---rubalubetidofikapax.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/50157952608.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/amprdebpk9o39ooea9kmoukonm/88260885903.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jixodewulera.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/64356265949.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/4056476143.pdfIn PDF document text
    • http://blueyee.com/upload/file/17000513846.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/raxufijozetotozeletizedug.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af081ee1c0---53287271337.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085295b1426e---69940973241.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/350271130.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/l2e7e2vf7i3a66c4psbq0e74bf/67283816896.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/rozebexi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607103e3d4218---xukuwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=formulario+historial+clinico+pdfPDF 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_off0000b8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 15692 bytes
SHA-256: 194828e63b9f500e91655bd19108359a50ef3e1e5adfc6c01b4449f7895ca6ec
font_02_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 10832 bytes
SHA-256: eac827f58a3d333adc28ff6d5ab1c38da4cedfd40bc272fad8c3df9163106728

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