Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a033ba23f27fd1…

MALICIOUS

PDF

89.8 KB Created: 2021-07-02 07:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 490cfb9fb3798f2d0a0f80061a0ba9ab SHA-1: f7c89f3238994a22a8aae01278bf7ff400e70a0b SHA-256: 34a033ba23f27fd1372b0606fade2e0d78b2628f1931adfa7f0353fb5ca8966b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is part of a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=order+of+draw+of+blood+collection PDF link annotation
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tns96199she4te7s56r35m67o1/tawogoba.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24cd1efb00---36938473398.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/lovulabinewadotejos.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787a0b4ddbb---gebajufofageki.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/38338306279.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098999008570---52832902642.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502234449399720.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/87711787486.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/12740376950.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/detolifekifupew.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/93475744332.pdfIn PDF document text
    • https://alutat.com/data/file/sijeguxasepe.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/86232d093f962771dadd551308cb2e0c/vixivuxakifuvefugilen.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f7b9b374---69084689569.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/37172096386.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096fb550af15---77028055839.pdfIn PDF document text
    • https://mnlex.it/file/41193721550.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/faetdt5ab1rsc7csur4d3aoap1/85070443226.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7450180610---78178487832.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/dulumugomuf.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2338b2a1a42584ff9b38365c272d373/dugivono.pdfIn PDF document text
    • http://voijin.com/userfiles/files/73784686793.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609666cc29bee---fununifekurepemisex.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/lujujejavoxenirevufomijiv.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3c9fd61ab3d4a1d08655a4a5dec1295c/menixemavusebagot.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_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 17600 bytes
SHA-256: a42b6cde3dc9905de1d83d1a742310c500c486107918e4a9cb59c1faa60602a7
font_01_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 10552 bytes
SHA-256: 338a22d9caafbc6289713283dabfbd1b1d1d500c4317a05da146b13a45ab7777
font_02_sfnt_off000141d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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