Malicious PDF — malware analysis report

Static analysis result for SHA-256 2838f853314bcc32…

MALICIOUS

PDF

84.0 KB Created: 2021-07-16 12:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14ed30c14de35d941b3484035b9ebead SHA-1: 7f97b65fa701f4f308f365a4a6380110b6339f97 SHA-256: 2838f853314bcc32dc83a69fc7f77c6d3dfe440a2374c8caee7921f9e2384778
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and link farms pointing to potentially compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=squamous+cell+carcinoma+internal PDF link annotation
    • https://defrokatilai.lt/images/files/bifotikixufosajezut.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160cda38fc734e---jekubarajurujakuwuzep.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94410051be---natenivigonojixamibowonig.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed8f9e1ff---79324935884.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ec48ca1b9cbaddc2483e1e90aea81ef9/411444349.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/dalebukiwitiluwepotabetu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/89ce0885878f69e6f70a760b31e8f9cc/13088443010.pdfIn PDF document text
    • http://teplospectr.ru/images/files/4401217118.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076f42f358e3---95942168023.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/gafifi.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/81828832890.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/71352712014.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/obtr58t25r5ev7t6mfhv6s73qb/josexasuri.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qsk892rk9dcugnk2gsk5esvvjn/48402672982.pdfIn PDF document text
    • https://inncredel.com/uploads/71659868191.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/87d3bdb79cf9d01ccc87b93cefee33cf/53256589099.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/xubeso.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fsho2inv21b38sn2jrettuqoh9/zejemu.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f500276e2d---32930782708.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/q2k7d1plpq8kk499nt3hav72f2/bewarizukitumup.pdfIn PDF document text
    • http://fitviewer.biz/files/file/mojevofovilebilagazunun.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca2f53d26---30855673645.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/968e846f05d15c1aab32be52e2625659/vipunepeku.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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 16448 bytes
SHA-256: 1ed5d26802bd12fcc46f4cf1a05bb56eeefc08b27368ea7a3c7956838baed09c
font_02_sfnt_off00012a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0D 10712 bytes
SHA-256: ffd3bbf78a6d7ad2d08c4fe4b46de0fe59b577b45c8452798f6b54486e37454f

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