Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac6517d576b229b…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 09:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ec622fef64c6c55f480ca32b15e5b97 SHA-1: 8dbc0b8fe02b4c04b840ccfd9f4c09812a0f9485 SHA-256: cac6517d576b229bb07870e9a06d4f04460eb580ffa1414199e8a72d60a46d2d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using compromised sites to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://beijingxinzhi.com/userfiles/file/20210507082041_1149656726.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f65730cf---wovoguxogiranewadezutomo.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/18879447852.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/72690974526.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/57900466125.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/wogedidilot.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2mt0ga4430agigsg1tir0ecoh5/rozukogonafiwoti.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/19636039294.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/41352153460.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9cd7e5c9b32c3f63e7e34107e87e503e/15622673777.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/rorafulufevi.pdfIn PDF document text
    • https://arerp.kr/data/file///147982878.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/11249277198.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/lajozeduzanop.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/89320840224.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80aae6cdd0---falejinigofiduvatuxuzu.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/41391048278.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1610925db98bdb---5123177918.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/32889173206.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/nivubeluvepamutotezevek.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cd919391bae071afb54f48bc2c832c9a/zasifi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/xefurawuwuz.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8f4216b919181d2ebaec09877271eab7/78777441389.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/31104116012.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/xosemefijufapobewu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5e7f3trm44l7aeu9uma4jnmbqb/fukevijuvulivuz.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ed876086---41678720404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=origo+gentis+langobardorum+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_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 11104 bytes
SHA-256: 5745c0557cae592c7bc650b3a3a838fc1a1b4237348e3b24c01efd4d5425fc48
font_02_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 20968 bytes
SHA-256: bc297df431c2422c21a033e1e0921cf4fc68d87057925a82965cfc76b26fe30a

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