Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fbb8d497a720b6…

MALICIOUS

PDF

93.3 KB Created: 2021-07-16 15:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d66f002441a401bf6e4d2a644dc9d56 SHA-1: eb6f78eace6582caee2795f80a7d0cf98edc519c SHA-256: e8fbb8d497a720b6e79bf4b69df3c34f1c77ca86d6cc3b4c7cf90f07913e44f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for redirecting users to malicious sites or downloading further payloads. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=a+quiet+place+2+free+movie+stream PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a843d94e8c6---puxuzimibetew.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab055c5a486---xaviwepemusosufed.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/dafemuzatezagivubim.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/58ee4d7b533e71b6d986e9c9057e9b5b/wisezok.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/tivapafuvefasamejelona.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107bedd310---momasimuligose.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/80681887844.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4539bf2c20---65662519648.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfbb8afa9---8747024124.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160811106030f4---vadogo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7v7imsvj38k67epikmn9mc3o31/55929017594.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1b323ba3---33510310970.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/685324518.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b044ff77e36---zerokebakinimuti.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6591c912f7---99042325686.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/papefaginokibijufakoxirux.pdfIn PDF document text
    • https://ecoretras.com/file/gunoza.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/591ef9e8380da5199d5d1a9138ff1a8a/mulesuniv.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/02fe7b340d52271d5d29f3ae3d1ac005/83122012260.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac975971e84---tutamuwudeparafovoleru.pdfIn PDF document text
    • https://subarini.ro/mm/file/budoxisuluvesil.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9694fd2596---14546807576.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0a68a663---50642543287.pdfIn PDF document text
    • https://amblamy.ee/upload/file/17267106994.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_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 17004 bytes
SHA-256: 5eb228b00d47e4e809355da14c560e41ce81a676aa815b12cf0b1cd31303a5a7
font_01_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C68 10948 bytes
SHA-256: d07762f5bfe348150dbab64e24a69de35550f82ac623bfce7137ced3ebe77dc7

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