Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e1b490b39b7cdb…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8701fbb3a87e57d04e89b5c7c9e9af5d SHA-1: 6c87110f875076a767a94b56d25308f9fe84195e SHA-256: 66e1b490b39b7cdb5bcaed88799a51870faa87be960295acb3d1cb01fde874cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=red+cavoodle+puppies
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/35f3589a75d47ab106fb319921d2cd85/kaxawal.pdf
    • https://unibel.pl/pliki/upload/file/91832871350.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/415d85e515dece526456ec580598226b/pavigivusamirak.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6ff0dd17---6601966515.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/aa18ca8599a2783687564dff8d132608/xogalarurosode.pdf
    • http://myucmas.com/userfiles/file/bajad.pdf
    • https://alnahamgroup.com/userfiles/file/bolavoveg.pdf
    • https://osikovo.eu/webroot/img/content/files/66148869572.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2hvik4shu0u6posliv6umhl7e0/20186750503.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/de59b96662711915c76f51dc5995a160/95661746642.pdf
    • https://nocenzura.space/web/img/podborky/files/44104605776.pdf
    • https://digitaldaya.com/imagenes/file/41899833566.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cdge1faajo6ub2bitcvivf0qa8/98965329974.pdf
    • http://akvatoria.by/UserFiles/files/52115070563.pdf
    • https://drsaman.com/files/8450514459.pdf
    • https://balaji-technology.com/userfiles/file/dudevabazorifaf.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d692b4f12---19225563377.pdf
    • http://utuin.net/files/fckeditor/file/sonuwikeko.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1fprdd9palg4bjbp0hc1nbcd26/fonopozuzix.pdf
    • http://abc-tel.ru/data/File/xiberitabaxezi.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/63820627744.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/79491892915.pdf
    • http://www.allatpatikapecs.hu/images/file/kizatizuzakofixitex.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609422d1887d1---32962102961.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16092b18915db4---nokevosidunilegufelupe.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5cf39cea93ca956e326800e0889b51c8/92248528064.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997506a6aa3---14974484505.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 16792 bytes
font_01_sfnt_off000101fe.bin
465e87e986c0755e711f1409374ae680aaad2fb30f53948798c69ade3300b48f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 17644 bytes
font_02_sfnt_off0001306b.bin
e71bd05e739894c778a7bc384feb536e308db2cfc6f6aff73827102de20d0ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 10416 bytes