Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd56cab4ad6abba…

MALICIOUS

PDF

111.3 KB Created: 2021-07-31 06:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 63cce160752a87680e6b016ec11051db SHA-1: d92896e5229dd6ee9fb5cb6a7a6ef53abdabec2e SHA-256: dcd56cab4ad6abba86e128f8c6b5568f62b4886329bf5cbd9f142a76d364221d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://broadmoor77.com/clients/39738/File/35021017786.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/uef8hmasum44g1gqbvb8r6qtjc/juzobuvasokag.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd650c9a59---38961765388.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759867c6bad---86916097820.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/42262754178.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/30124746811.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/koho0irrm7iujt369b3qt12rm1/lirufuz.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/50798019760.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730e9b3862b---15385873386.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e5a3326b---rudaguneru.pdfIn PDF document text
    • http://93564497.com/userfiles/zoziliresufibo.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fcd2296d348b11e259cad6689e3a6ce5/witawapotejezotebekarasin.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/tiwamogewinejuvuni.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/667f1c7c39ecc18626892356907abde5/zozitudawigumixodan.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/hd16bk6nuru4g60ee6e9efpjkk/botojokupewu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608035c46a806---89050402165.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/wirevekigizasi.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/79778893816.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/56042765736.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kexotivigezamusujig.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7ca2b213d---92519493938.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1db6936a---60083860821.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/nexofubatiwegadav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cuanto+tiempo+tarda+en+eliminar+la+nicotina+del+cuerpoPDF 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_off00014a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9F 19388 bytes
SHA-256: d9b737beeec1d9d3958faf6f0faa41c20488fc99b641bbbcf7608764c516108b
font_01_sfnt_off00017c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C98 10640 bytes
SHA-256: 1621b61a6280505041a6e4ec83fcaf8eed171460f0494e9d87e864779cbc1c7a
font_02_sfnt_off000194e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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