Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1d95b6ac0c6827…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 08:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99bbbded8d7d7a12e86730b5fa88cc13 SHA-1: 911a4722e3ee9c62c5948c205aa772f2bccee979 SHA-256: 8f1d95b6ac0c68270b124f784596071f00271dc0d1626f293c3a9f0fa8ed8154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the extensive use of external links points to a social engineering or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://wastran.ru/uplcv?utm_term=makkar+ielts+writing+task+2+pdf+2019+january+to+april PDF link annotation
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e494082879dc8aa41af4cad12922c343/kulotubajigukedodupar.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210702223452.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xasemufutifesujuboxewagef.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///pavusabe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23e94698c---mudujufatoger.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/xuvegij.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b099a852a7d0a42179ba6377cbfbc84f/niwopuvobipawos.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/pagap.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/tugenir.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5a22463607d20b6bdcade36dd78fc817/bizodikugetijix.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/wubejipurugetawupasora.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/wagijalixis.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4f3dd204e103f74a195c7473c073f2b6/35535297752.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ragur.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/janukiferideginazes.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a7215edb---49519396119.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/68426121830.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/23742162326.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/20164866111.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/6237209229.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/bd813cedd8b27bd5367a9b4cc3d514bf/nexuned.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/85062918908.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804e118d3b0---pelipekenizema.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/51890509643.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c756654d9f1---tegad.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/gupewujuber.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/3655685401.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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 17516 bytes
SHA-256: 7cf9f40e4d8478f4792df77c241a713605e91f8ee7f27c05dd8997a937f9d428
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 11648 bytes
SHA-256: 063f4e14b69099d9a7f72036e849470172f3091d7a4824093f6127449cd83475