Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2471a35bc70d1a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 04:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4da90d210fb0081baa5f25c1e1e4621 SHA-1: 28d4b161472e78ae4946c2b09df0b7e9cd573f6b SHA-256: 2a2471a35bc70d1ae04532763cbfb76868c09f6d623ca635bc37792de41d1ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=the+magic+book+by+rhonda+byrne+free+download+pdf+in+tamil PDF link annotation
    • http://olivetheater.com/userData/board/file/28386213164.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/33268510724.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/rititipuvupofoseziw.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/91495782634.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/96325425078.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/rebenujizamiga.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/67972668190.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191626157173.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/xogepegamaxad.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132769f8c67e---58244551149.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lipegorozotow.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/lakev.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bavebemesagumuviw.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/gugoluxusa.pdfIn PDF document text
    • http://mrybalko.ru/files/60843574420.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/lepikomi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab5f37512---wejif.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/14cddfc669d4aa95014d918c7967b151/32651777237.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140d8630a008---wusuwamozepo.pdfIn PDF document text
    • https://iwistw.com/upload/files/jixivofobibetukaziwu.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/26544642792.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/45869532040.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/61028669393.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b6f6b7f487e050a14a313990184cfae/61404160387.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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 11296 bytes
SHA-256: ca40497671d21bed8823786be5d2f5b49bc25caf11d21a17cc5e67bdb7c9b941
font_01_sfnt_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 18316 bytes
SHA-256: 61bc9be5113fb55ef3dffca0c93b02f718ffda8ff7d846ea72562bd2d0bedcf0
font_02_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1