Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec40a1cc2865320…

MALICIOUS

PDF

100.6 KB Created: 2021-08-05 14:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc52bba15ffccf29872634a49b69471d SHA-1: dca03b3d753f6cf7b7d69e195e54fbceca64c246 SHA-256: 4ec40a1cc28653209e4c04c22b54642f05d5c8e13c7adde202e1ed3d804bfd82
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of external URIs and compromised CMS links points to a malicious distribution or SEO poisoning scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://neodentpetrosino.it/userfiles/files/diwapomitefobo.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2rhatikgca7lqpa9khq54q3pl6/tesabuloxebivugibatovun.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a5f209150---7765543094.pdfIn PDF document text
    • http://ttc-investco.com/img/files/29841876967.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4fb985bf6783f90c9f5d6201ecbb418f/firovabonoruzigetoxe.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/9710559388.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/78786425854.pdfIn PDF document text
    • http://llux.vn/uploads/files/xojomibaviveboduwifudiwij.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/rasazibimutelak.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf666cb839d---pusog.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4b5726893ec2034d86deb8fd1729324a/87843953542.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073df1a96cf3---juvagafoxofuxof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74370ab6c8---fefoxisozu.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c4a18c9890c74154624f146dc2bc79f0/wizuzud.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6cb150ecc199e31139fbd987a63e6549/77800647139.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711c4613a13---82590638718.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f50fab017a723f7d9e47fadf5298543e/74428858233.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/26317072993.pdfIn PDF document text
    • http://aven.su/userfiles/file/85449662612.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c183b7871d9a5e82105f03fc603b1ec7/tasezebuteloxovazidupoja.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gg0s14lkkh05bbubqeki2fa0nk/31105177332.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979ce88f768---rugumural.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/sowow.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/jometebabugo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bvm57jlpn023o58hfj9p51iot2/62033945581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=who+moved+my+cheese+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 16448 bytes
SHA-256: 25b9c34b44ea6f8dffb183aedeeba05c5cf292536b51eb25ccbdb9c4140b58a6
font_01_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 10660 bytes
SHA-256: 1fdc9e92b608bf61fe701c2fcff9ec0ccab9224244eb1822f7a11064ea504cb8
font_03_sfnt_off000152a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A9 18516 bytes
SHA-256: b5cbdb818d96f9a2037b543042be207e80ece6e62762b23e823d4e5deb798b78

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