Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef828fa36ac22eef…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 17:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a58916b4039a6ad07c3e831832f37f18 SHA-1: 4a6f9b635fb01528fa37e8655b8f33cb0201831f SHA-256: ef828fa36ac22eef90b002f966437d9b8e4b3dceec80c28732f6d49bcce70ab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=watch+one+piece+online+eng+dub PDF link annotation
    • https://mmrh.myagenda.cz/pictures/editor/files/kijikukanali.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/88555530007.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/fifugojitikejiwimaridora.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/gudawanumevurobovufu.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/wubodisusunilexulokuvi.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/47168609181.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/97285827671.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/41400479714.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/58f665899b28bfead23f00dbe7184e3b/lotazuwusuv.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/galafuvaxatinejorukufu.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_235316_9165.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/11600034001.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fumaxujesonaw.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/kolepibojetet.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/madoropiguwodafuviwele.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/dinumu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d98a1484---jukujewupubeloz.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/18136311190.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nulewijidawezo.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/69717631183.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/27850124009.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e7d88513---tadeteserapunexumutim.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/64876722438.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d69e820400c2d3fbbb06516b3c75142b/bosolugiwikowadi.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_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10756 bytes
SHA-256: 9d3baee69c3e3cfdb7baf119f52a34a3a2560469ddfcf93aea8279fccf3caddf
font_02_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 18160 bytes
SHA-256: bd8cadc0691156ea403bb91bb9e1b0902f0be1bba06320e351a1c3876d2a810a