Malicious PDF — malware analysis report

Static analysis result for SHA-256 d928e8939da90728…

MALICIOUS

PDF

78.0 KB Created: 2021-08-13 06:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e733f1666881ebfbfbbac43bedcaa99 SHA-1: 1ac8aa0604c249f868211d5bb0cc80e8a5f5201b SHA-256: d928e8939da90728ced1dc1eeb0e40d10455fcbdfe244927b3614e8abcf4c6ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to various compromised websites and disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=historia+de+amor+pdf+piano PDF link annotation
    • http://maslatalaia.com/userfiles/file/sixinoxezunam.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/39d954615168be295584ed5bf4559dcf/sepafanomuzadubowojolek.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983230a5dab---kusofibigazugazinibi.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/lubijip.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983685042a8---42884156398.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/vukomirasunogitowotebira.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/80473486049.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1644c5d195ac4c83bbbc08668079f96d/numiwe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ba88d363165364dad4f0ca0fb8a845cb/xuvigepugu.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/34702429142.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e9293fbed7eb3dcd14a3d0263e6277d8/66508699721.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/bijinugomizavupeb.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/kiruva.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/8ab6d9731b84094c3ebce292d8c2f7a5/62910185570.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c62764f8---gizusewofawarix.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/040695bf515b49a9816809d42aede7a8/20500473798.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f432854491---vogoverujirez.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079842028ff6---nofidavezi.pdfIn PDF document text
    • http://myqself.com/upload/files/50453305669.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/xefovuxoruxikiposot.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/nmvf560jb8rahloro70e2lsaod/pafobevetagobibalogomidos.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/kixonutiv.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6ba670a6---76276227775.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/zajajojufuwa.pdfIn PDF document text
    • http://minipit.com/data/files/6929718265.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_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 17396 bytes
SHA-256: cca56d50b32040e304978bfdfc44dda35b1483a45e46506c6691f4210d2c413f
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 10604 bytes
SHA-256: 6f681ee3d1e4b10e7a11297aed5ab3cfd50298059f56fa9dea9b539f90ded583
font_02_sfnt_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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