Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d69d88ff1b442d…

MALICIOUS

PDF

88.5 KB Created: 2021-09-21 08:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc5ecda460325bab54f935643c666785 SHA-1: 3ab2103af88a6159376f4f5bf2d663bd467508e0 SHA-256: e5d69d88ff1b442dcbf624a016b46032d45178edeca060c642c6362c25e81807
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to a mix of compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://garglob.ru/uplcv?utm_term=samsung+tizen+vs+android PDF link annotation
    • http://udmvdpo.ru/images/files/vusebaxugano.pdfIn PDF document text
    • https://stotex.rs/files/jujaz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r6m0966au23rkald7g65efev12/barekes.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/14432868992.pdfIn PDF document text
    • https://micsys.in/userfiles/file/23593813689.pdfIn PDF document text
    • http://kaies.net/upfiles/file/9744833108.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/56783272474.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/8200952627.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/29423723931.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/20601590998.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f688634d1cc39b879c7ad029fb5087e/bigezakonobune.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/pezoluzefotidanevu.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/jenegemoburijije.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/gurijepojifetikatofe.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2d108cfab---ruwipudifade.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210910_7AC8612BBCDEF2E2.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/31075069979.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161496e6e4744c---56601360781.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/07/3710941461.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/merijizasu.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/94158580429.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86f5e2d4d---52793204398.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/duxezoxopopewup.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/8350919010.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 24500 bytes
SHA-256: 54f0d60a4b1cb288fa3d28c0098d4b7eb002e3f4918c96256a8b9411b3d7fc08
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 10844 bytes
SHA-256: 1df28f33f6aa4babf6f5597db4d2fc980e3023728da71f07c63d5b8c75c33374
font_03_sfnt_off0001336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_04_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 16672 bytes
SHA-256: f0a2211c8b05f7fadf301a93f6630490398dffe83934ba63dad3de91bbd4e4ef