Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b2285de573d228…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 07:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48ae0ee275d6c064f0c7e15147737189 SHA-1: 5e9fb43d09338af15bd8109d65c4972a8cdfe693 SHA-256: e4b2285de573d2288ba3feee5eb13546e1321d76aa3f3f12af3540f750373a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's output suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://catamma.ru/uplcv?utm_term=boboiboy+galaxy+galactic+heroes PDF link annotation
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/88a7ded613e24b6ccd2ef72ff4b2123c/87774795420.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1307524148613c90a88d6eb.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/demurirujodajebuvaf.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/42443175126.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/64607142110.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/tuvilavevizav.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xumetewibem.pdfIn PDF document text
    • http://skisun.it/userfiles/files/xekibexolerefebixe.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/96456568489.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/fanoxudijigokaditalavota.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/8183523951.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/57863744588.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/sekepapibazomotemijijo.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77541427666.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/gegesemejilamazewid.pdfIn PDF document text
    • http://nenorm.com/files/files/mivojawerapudujefaxuboxo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398d9ee9409---xesinitete.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/84857901304.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/89866431292.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/vuvabazafowaxag.pdfIn PDF document text
    • http://kachelofen-prommegger.at/32161537450.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/dojojozapidubi.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gamenopexulolivasos.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/bekugomeg.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/220339ff0080a3a2b51cd8d6211b5055/8239404536.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/80981437345.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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 10812 bytes
SHA-256: 15763a7fe1acffb2c7a319efb7179ceabd8899732da3d988b24ed48843eb1a2f
font_02_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 18564 bytes
SHA-256: 62765413868d5f8728889712d3eb37cc04fc19bd28c6d27da9cc92cfd9a07d2b