Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6f35bbc1093642…

MALICIOUS

PDF

75.7 KB Created: 2021-09-17 09:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8022b185bc30e832b9d97a61fa75ca34 SHA-1: ee793f309e0157b34b1b7179f836f98ef889a57f SHA-256: 2e6f35bbc1093642a2fe659c722d240b01543f45da4225a9d3d655a3bf734048
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=best+apk+movie+app PDF link annotation
    • https://carsen.sk/editor_uploads/system/files/nijinadidug.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/16071426025.pdfIn PDF document text
    • https://designclarf.it/file/68505203072.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/getixutidupewux.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/roxewesixemev.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/25254562019.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6b01e356aeedc0c6f903d45715a7defb/90888516422.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/20258635284.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090709182580554.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/solevudibefenus.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/98303710234.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/55612555518.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a6445f90eb52ce44fe152256a070db3f/34138840289.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/tekuvelutujefezo.pdfIn PDF document text
    • http://szjg.hu/images/file/40207103190.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210909210307.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/mumururaridugafewaxabedo.pdfIn PDF document text
    • https://kokomanis.com/contents/files/74465546639.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/masawibi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/46379421542.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/73968021461.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/mirukudituravetedafana.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/49203253934.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e25962904---27993712318.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/devebupifazizibuvali.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/taxubogipiwubirudira.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_off0000c453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC453 17468 bytes
SHA-256: 37ff260bd28ed43fff8e76a03bf30ae6f0393eac7953cd48a9dd7f09462634cc
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10372 bytes
SHA-256: 69a8267997d65add59c24568d901336f3d27d11f1ad5580944ea10fd310c1cff
font_02_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1