Malicious PDF — malware analysis report

Static analysis result for SHA-256 348b27902262a9ee…

MALICIOUS

PDF

95.1 KB Created: 2021-08-31 19:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a00b663b324e7afadad97870463ad31f SHA-1: 87bb3fa7fc17bd71a3d1a86e62453d1242a9b28c SHA-256: 348b27902262a9eea837213e55dc5ed31b936b19a5568b605f4439ce6959ce22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the link farm and the detection signatures indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://centrumbiznesurawicz.pl/userfiles/file/37748058324.pdf In PDF document text
    • http://orhs89reunion.com/clients/77823/File/19352266745.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/divugujero.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/daveragabi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612a9e6303b9b---tedazaletajebexixigabuj.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/248df7ae214acb314253f9e40aabee96/gupimuz.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/sujivuxud.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/wibanowuselegomopepog.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/99231708255.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vb5u3ee52lfjtc6o10j581iu53/52402927495.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/xikiboraposuxokoj.pdfIn PDF document text
    • http://fs-select.com/images/blog//file/tananesonifup.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6b27c92f516f5a76462bcdee572fc4d0/votazepafuzevakosepoli.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/41170370239.pdfIn PDF document text
    • http://foodchemsino.com/d/files/sorudexux.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/46501679112.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/gekaxutulog.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/bc333f3cb6bb4f09e63be7cddeb5a0ef/59787094922.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/nurek.pdfIn PDF document text
    • http://wamer.org/userfiles/file/93414784321.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021082417122390.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/jigerutil.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4a6dc45064b73a8e0b5c81e711e29248/69019831064.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/kasunokikotisabejax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+give+yourself+a+knockback+1000+stick+bedrockPDF 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_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 21912 bytes
SHA-256: fcf19662f6a53991927d592685e79d15bc575529a13a44ebbfb61f80177c6dd2
font_02_sfnt_off0001531a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531A 11416 bytes
SHA-256: 82aad0befe29d8a45958ba0495ca09f34515310c32ae81b3d2d62ccd2dd3f09d

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