Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f385775b99e045…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 23:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04ff291e20fbf7fd350e0428eeb803ea SHA-1: 6c3626012aa1ca3f2aff3f58c2790ceb9101c1a6 SHA-256: 11f385775b99e0455e79d381087d687a9e68c87b73b446ceab6db956d1ec6340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=linear+equation+graphing+worksheet PDF link annotation
    • https://dichvuketoansg.com/luutru/files/lawigevejufubuz.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/kegalowemozenupudid.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac745bbe53---97443817777.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/vudolasudubuw.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/ruvefedaxujamodowetabi.pdfIn PDF document text
    • http://foodchemsino.com/d/files/30613980826.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/dugewox.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3cde2109---74020225240.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/27688753980.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/texasuga.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/wijolidewawu.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/kemevasatipadatabuku.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/punofolalofudetejo.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/vofedeva.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/90369717070.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/26762944425.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ea2133ba968aa398d82752688839608f/niwuroruzukol.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/8247429052.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/16996021029.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/jumomazukuko.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/0fb91c69ed9df7af375e329202a29f3f/zodifagefukorakosikova.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922af7a1653---95864874278.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/94041519594.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/12114116156.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 10868 bytes
SHA-256: c9bfff6ef529dd4e5533961d6cc4f019ded46fa03b91fa49fb7385e7abf4c2ae
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 17744 bytes
SHA-256: 27edbbebf6e9a5892cf3dd3bf915ce84f88e23c5d863949397d0d3285de9c50f

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