Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eaad7c0d7899941…

MALICIOUS

PDF

96.1 KB Created: 2021-08-14 13:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b8e883c005d684dad0f200d226bdacf SHA-1: 5ee37d942748ec4be0beefb130cdcccacfec1db2 SHA-256: 1eaad7c0d7899941d463204cb526fc9d398b77b24687242da296c9e0d13759c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://knurussian.kr/DATA/upload/files/202108040535351349.pdf In PDF document text
    • http://komputerzagrosze.pl/userfiles/file/55789119809.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8cc8d0ace2f81c6614e2ac82ceda2290/40964233802.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcdd69216---7096650319.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/87586471667.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/92458591178.pdfIn PDF document text
    • https://egca.fr/userfiles/file/moxeladesimufiguwegiw.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/06/202106290328007438.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaaa19c160---wevuromu.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/mevajabikutulewabevo.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/bimurikibowuxuwug.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/86unpdrgup25ojbnh7qk9bno95/nutinapen.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/80319019680.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/91774007760.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/75025589957.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/reriberetixuzoziki.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/panemijilibujiwebilixade.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/97951544046.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/fujuzizoxijolusazuxusu.pdfIn PDF document text
    • http://ciskmv.com/css/file/puvapipetir.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6c6b0d0f538b79f5ed032378263497cb/rajagutoj.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f236207a5---58518155574.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210611111401.pdfIn PDF document text
    • http://mav-auto.ru/images/file/nizemapuxebixudu.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108040650331890.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e3b2db2fa08f8ac205e828d245aee938/32552992834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+song+helter+skelter+really+aboutPDF link annotation
    • 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_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 10828 bytes
SHA-256: ecc04c27508c1052e54dad1dc34b9e61a19ea9f3ffde8019407ecea064b83d00
font_01_sfnt_off00012b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001433c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 16912 bytes
SHA-256: 7b086b20bb1410a099f0533d31602cb49e94272f2a0be914a5785288fb8e0794

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