Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6db7d76f077237…

MALICIOUS

PDF

100.2 KB Created: 2021-06-28 20:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3bb399a203b31ee1a722cc688c7eb0ed SHA-1: 57e9fb14f73e1d26c44822e644dd3beb30291056 SHA-256: 8a6db7d76f0772378ffcc9b500e5d4b8245d63c077e6e8f3e391349d41cb0eed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in the URLs further supports the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://synerhu.ru/uplcv?utm_term=best+commercial+ozone+generator+for+mold PDF link annotation
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f8305469---9494917116.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ea02f99d177bdf66b2ed0c977ca0f21/toxemovovajumixibuvil.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/88cc0ffc607cebe3464e3dc18fb1afd2/toviwisorajepise.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc9ed436f---tekuzaworaniroxowokit.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/05b009cbf0278191a63f0ed2088799e0/fozumezaxujagedonizewov.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160832d0cc3e28---lewuz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa3c3e7842---gabojeposeruzosogakeg.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pujavozexulofi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082637a84906---60379266251.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c48e0dc9---73758660175.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f64c115b2196bf913a89fd61557dadff/fiwutekolono.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8cf37c73d6078f11ee9c0da646f784f4/sizenu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fjjhfocfs02i8kmrg4d8tpkvr7/tesakopo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c195ede7d---jedubafulelodimeb.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sarilisivire.pdfIn PDF document text
    • http://debden.org/userfiles/file/62173154036.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ca36a91b---silepikatonetewobopikot.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/zulunovuzenukerepupuzifu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215291728183789.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/sunulawokajekirugojototev.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec0e7f2576---13749601590.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/sakidekowesugezaja.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/11215287294.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_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 10932 bytes
SHA-256: 577899027ba4d12d94ab6ee33fdbb439a74448ffd0de77c10f4ec1d963f8cb90
font_01_sfnt_off000140ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CE 16416 bytes
SHA-256: d5a0a6387b8408aa1aafe024aff4de96572751841e31bb3cc59fa0b09636e43c
font_02_sfnt_off00016b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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