Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b8da0399a456f9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 00:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d52071f471021c3de30638dcfa58d4d SHA-1: 79d8dd42a290a1d355e67e7c5133d02632d6c7da SHA-256: a3b8da0399a456f9177e9609b3d965143281e45b7cb4a55ee0b4e24fb661b016
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://oniceh.ru/uplcv?utm_term=zoology+by+miller+and+harley+pdf PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef1d4c548e1acf78a16289ca3a9c24df/44655407316.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/80636269121.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/86129557986.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vitekulakubekireb.pdfIn PDF document text
    • https://seerupit.dk/assens/file/xurosiwoku.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/mujasokupimor.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/gukisalorodup.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a3b42c6ee2043a31691f4abeec9bc6aa/wezesekafubibepum.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/xewivewaviputuzuge.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5b429258---57475904554.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d8f3892215b8a96a39358830f0c67691/zebid.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaca7baa1---sasiloforibuforonobesam.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd50380e5---gaximuviduvorogosazejor.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079222f453ba---daxajabivenoziselemipe.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/wekimiri.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/nutegogexamusejatodat.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2e6c8217551564b82309d05243f862af/78180717119.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/lekezapaxonuge.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-11/20210811151737784864.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/lanavafemowojeke.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5e69a9410a41602298eddbfcf4b1f1e5/vevonogiwuretotebaze.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d0bd381a9---8402223918.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd834e657---78155365122.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/klf7cpbs1ns00jkc06f2ktk5o0/13775783256.pdfIn PDF document text
    • https://blogsma.com/files/baxomuzurivitajetoralu.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_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 17764 bytes
SHA-256: c65ddcaed75b47a8aad68511c66465087ae9057c64b1cc6ca2fd9592ab957f08
font_02_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 10896 bytes
SHA-256: 9f07aff57b5cb70934bd6c6f15670f80543b5dd2e133f12b3b50eb473263e6b1

Open this report in the interactive analyzer, or submit your own file for analysis.