Malicious PDF — malware analysis report

Static analysis result for SHA-256 536588922ac948f9…

MALICIOUS

PDF

79.5 KB Created: 2021-08-17 02:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3ea3903a5517f22580cc8f02e0d655d SHA-1: f9740a1e5cecfea6e3a9b5b6efed81bb0e2b5bd8 SHA-256: 536588922ac948f972c207d0d45032f5d3b1ed627f21a288c471c317695441b9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://fohow77.ru/upload/file/xajojanejevomidano.pdf In PDF document text
    • https://sporyolu.com/resimler/files/87777667905.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e127ce2d673fa3261a9ed6c9de2e1341/diwukewan.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7a30e02b5---powebojodarijotore.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c100abc5---zakazonifo.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/libuzifowubibabopumosevo.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/meguzajozisefapurabevevix.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/91689669772.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/91078895284.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/tetizelizesumoxojeg.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zipima.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160711490105b2---xejevepejul.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d11a7d468149eab0c78bd632bfa958c3/49039784851.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/wekemumusesudaladapebix.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/luwazosipatigizuputilus.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160827184660cd---lunogupuzedaxejifu.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s6a00vk4vn1imhg9554455h9nj/25587281964.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/tifazulaxamivulujefur.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9baf7bfb26be7c646f4901573e26115e/76495584808.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/26934508757.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/fiwavebidel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+much+stamp+paper+for+rental+agreementPDF 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
    • https://rb.gy/vbvdt1In 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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 16156 bytes
SHA-256: 6986d97059880f091bfbcce67897a08bb6d2a49b19f2a1d82cfa2f93d95fddb0
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 11012 bytes
SHA-256: 39b9b3695e15944181aa94b3c3596e4aa543f12cf187b0481abbe2a69d22f9ce
font_02_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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