Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcff96da85e0d01f…

MALICIOUS

PDF

83.8 KB Created: 2021-07-18 09:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c7461fdad0896ffb0c0f1d005378037 SHA-1: 88d94cea51488313ce7b6442e18f4fdb1995fbea SHA-256: dcff96da85e0d01f387050ab3b1dd379e43f2f41b32c359da6496cceb3ba4880
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links on disposable hosting and the use of compromised CMS uploads further support the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b7abce9---30256920153.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b91de015820da614e6c74b88f2bef714/zudotuganolawub.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dee5149d8---95144624558.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b06a8d3c1d2c2b9c0fa638aa9a115af5/legejupefulotal.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jggo0mnvbbmm4i1ia7478e0qcn/dawesuvasisorusar.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/90904328658.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0c119326e6ab5d8f5a6260464b3b2099/89121965933.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608596c7bc5d2---loxusefumazikukotefuwinix.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb74f22b---35548964123.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/dkeba5tmtgt012n37ttnntmi8c/98139501911.pdfIn PDF document text
    • http://mousike.it/img_ins/files/fafeforitomaxokaf.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/52970448084.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ed832f15---mebesipofedenovonosumide.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/07798b0b5a33ac1f1e34a507cf3fa08a/bezagikolaj.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/6a23e3c537f1fb8360672b080195a27b/venifuverisotiwimuroxodak.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d984qqs84d84a48ajcn5ao27j6/panosapixazuvevavekeka.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/54056948162.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/lifaxekuxekuf.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/40910769197.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/akaj7p00039j3q1s39i38mhji7/4533217879.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wonegosufa.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/aadd6ni132j24sin9uk1rv7a2g/bojekaxaxogofejagu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lixamulimuripunejesega.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f88c1b85ace73f5afd5376b5f4576bb7/65611461954.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/12776721838.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/a8d3c91e86fd0fc7d575c8990fa011e5/videwaxubujofumub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=jee+main+2020+january+paper+downloadPDF 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_off0000e16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 17704 bytes
SHA-256: 0ab65994150ae601053c7fb7bf5bb003e2f66b12a302715d87469a89e997496b
font_02_sfnt_off0001286f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 10948 bytes
SHA-256: 002f71e37408cf8500e632c51ea7723627e90cb47c6db6316e41f38e913e16fa

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