Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11218f7fe88afa8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 06:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47ea2a17fc43f431034720d7e0f0014f SHA-1: a16c425b46e039f6a6b79b83a12269b5e3f409f2 SHA-256: b11218f7fe88afa8bf7945a1d87e0bf61f0741c65de7bbb6ad282b4ec855f020
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to potentially compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://zoltysnieg.pl/pliki_wyswig/files/xewekafilakale.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/dawil.pdf
    • http://alphasigmaoverseas.com/userfiles/file/94820798771.pdf
    • https://hogies.com/includes/template/uploads/file/34736370343.pdf
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/lilefizezibox.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092692a5708c---kibitapazezexov.pdf
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/sinex.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee22c38dc---vaxoditanebamigo.pdf
    • http://sinhadventure.com/uploads/file/93867914937.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ffcea46d6f17d123404b4f68d1628022/tajajorijasewisev.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/ginekomevet.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be24e6c186d---31334153664.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/64cb7b6f592043c0bc2e95132995d48a/kolurigipigenajitimosudor.pdf
    • http://kirsanov-maslo.ru/uploads/mulufavubefabuwebevejimip.pdf
    • https://atvatextile.com/upload/ckfinder/files/14045735035.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4aeb509e49a74e4170373e0724c2c854/bujipujukawatulinek.pdf
    • http://altadirezione-consulting.it/userfiles/files/kepemobakimiregokup.pdf
    • https://edusfera.pl/upload/file/xidodawenaliwejapago.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d6bbf6d9---38114826344.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=maintenance+and+safety+engineering+notes+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e9.bin
ebf2c4a6e5e68368c3a46e8c2049629aafec5bf03636c5b46db256fd5bcb34a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 10856 bytes
font_01_sfnt_off0000eaf3.bin
29fb706cd128b440003872a67903252d7cdc3673923865febf936404e6619f17
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 18708 bytes
font_02_sfnt_off00011c50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 16792 bytes