Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2dc8df84a13da1…

MALICIOUS

PDF

87.0 KB Created: 2021-08-11 12:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 20522c3e4d98975fdab9efb4c767e8b0 SHA-1: cdb03d32a740713a2310904af171962e4074e9ec SHA-256: cf2dc8df84a13da16ebfd9040416e36016af24da472a6a6736e79a9418755095
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=3d+anime+character+creator+full+body PDF link annotation
    • https://koncnc.com/genelresimler/file/witudagutewiteviveg.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3245aff8---fibowixawefujegafugo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ab168e5e---kevetefabulasulo.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/29603722141.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/29710759346.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/jutarikutovina.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/95989142867.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a57b4cd6---nofojedobamiwe.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/2s3ecub3rvcjqln33cvv3hdkbf/wogaxiwomina.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e55bf921a3b---susefoj.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d94dd2b18ec---zabuxapekebovijikekute.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/30541815078.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/93391185039.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/tipotokotegex.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fdbe207c737c34584f4291f023d4b5bc/68500273625.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/3782068992.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/puwutofi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070270883603---75583470726.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/23947667434.pdfIn PDF document text
    • http://tw-jia.com/uploads//files/202108101151104334.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d8b4ca59---taxizurozejujud.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210531161415.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/lbh157r036t5sfo50ehcrm0o5f/sifepugezedije.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_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 11000 bytes
SHA-256: e1cead3d3819d898c5a4bb790902b9bf68a44318485f2af3f4b68eedd65677be
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 17400 bytes
SHA-256: 1c54204029c38a4ef3336f2159695be5eb1253d843c289469b97d5e66e5d1d94
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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