Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cf74336ecccb2a…

MALICIOUS

PDF

73.8 KB Created: 2021-07-04 23:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16ae2dc46f65299c8c70273a9777c765 SHA-1: 2cba9dd39df971762185fc448579d3b34d0394f5 SHA-256: 92cf74336ecccb2aea933a7f062f6d52d25f2089caa58a0929214f1c0187c856
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host malicious content or redirect users to phishing pages. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage for hosting files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a351dbd7a8c---39267745919.pdf
    • https://glycocalyx.nl/userfiles/image/file/senaxikevez.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/rogusuzoruma.pdf
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/xaxikekunivifufar.pdf
    • http://asja-doll.ru/userfiles/file/namifol.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6173077d1cee8180a779ec7a2bcbfdf/68677074842.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/59128573678.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/de3d57919aba436334de162dafc81af3/84391705582.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce6daa378---92752973778.pdf
    • https://landbondcorten.com/attachment/file/66679d11c3827f1e6a32cf212db1b603.pdf
    • http://beijingbeat.com/contents//files/damuki.pdf
    • http://altaprecision.com/userfiles/file/20522883502.pdf
    • http://acpiindia.com/userfiles/file/kevoxamaruzut.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/buh87rf91dptsu2o5bd4tocc0b/repaguxubejaxabovazofufig.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/266e483f9e5ebbf6230f56d5552fac74/vojetulep.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608af432cf789---jevupulimamaluzu.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/oqu7ba8ki7ibkkh6s3vd2efrvm/vojazosilogi.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/23450fcc58c04f8b06c4ca084d910b7f/kogeropovisagaxebawos.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tlu9bt77v7gur0j6u6al00b16h/56393444082.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4412bdff---lonajonefevejiduwitel.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/enrn6uq3pj733ke35d4sq8mva7/peduzubokegigagasiniboda.pdf
    • https://gruntbudowa.pl/files/file/66538312726.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d13e8f7d9---13362104160.pdf
    • http://capitaldanceacademy.com/userfiles/files/jexigovovodifujetob.pdf
    • https://acrgroup.nl/userfiles/file/25484837774.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b52b1cb1c---7787132914.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd4ad8e2d---61063641679.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+journal+of+infection+in+developing+countries
    • 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_off0000bd6a.bin
d85b8fa310b6097e1b1993d5f257121077d2e7ef354cc2f7de0710cde4fe1c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 16228 bytes
font_01_sfnt_off0000e7b9.bin
84d03dd2990fe425a68b475a32127673b3828c78caf846ed78e3298027d8f36b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 11156 bytes
font_02_sfnt_off00010180.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 16792 bytes

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