Malicious PDF — malware analysis report

Static analysis result for SHA-256 39281fe1c0ddb807…

MALICIOUS

PDF

106.9 KB Created: 2021-06-30 20:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58cc751beaba29c1d2d76a2672d24f66 SHA-1: 9d9106888e9aed397ac0a957e5e3b4bd83f24f05 SHA-256: 39281fe1c0ddb8071f1943787bbb5873432cb2a053f6da1c3de34bcadce2a760
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://drafthe.ru/uplcv?utm_term=the+bad+seed+1985+full+movie+online PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc662abf7de---waziba.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/neguvarogo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/finapajokope.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/vamelogufixu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e174f633---xugujinopa.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/xupomirud.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/251fa9fea274275dfa59f32a9ded391a/62923608233.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/e71dea83d6bd3f57686deaaefbf91ca4/78456554659.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3entrsmogi1vf0rqt45a19vi2n/najuti.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/90h1vvomc7p6bkr81l4rq951km/39900301759.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/it6893qbuihs8686bd1of5fpe0/39874037150.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d94d3ca0f---zasulozosofaxirixibiz.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/pifetixemoridopiv.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d68be4701fa---lomopeguropusejanapefedo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160759a382cb3c---bazisuwuvalanusojewu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c403e29183---35028929040.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/789918893.pdfIn PDF document text
    • http://marymo.ru/uploads/files/powizazaj.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/v9v4b8iq9t56pfe47jtjri25cl/bipetude.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e21f8495857f0961ae35b6fe08b69b3c/38290955733.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c8972707e4097871c8141f18ddf35ade/botidu.pdfIn PDF document text
    • http://ha-sine.com/d/files/84381715243.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086471089fe1---buvomasatubinag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 17732 bytes
SHA-256: fa828d0e0328fd84ff3ff7cfe73892aea23f6a68bf5e022379b10ce3c77ea31d
font_01_sfnt_off000155eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EB 11252 bytes
SHA-256: 0fdba71191641bdb1524ba3baf5df47975b9c0e59786a0a6ae85c1273b370ce5
font_02_sfnt_off00017037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18848 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd

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