Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95b2d296d335640…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 08:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8233e1a38a13393a6ae7e42e15749f62 SHA-1: b091376b74b4b7aba861236319f4635102d11212 SHA-256: c95b2d296d3356407b34335f0c9fd62ef730b90ffa8933927fcc5483c167f585
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, with numerous external URIs pointing to potentially compromised WordPress upload storage and other disposable hosting sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings suggests a deliberate attempt to obscure the true malicious destinations by distributing links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=pokemon+crystal+rom+download PDF link annotation
    • http://grandioso.asia/editor_upload_image/file/39151718406.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/sabusaxitomolarepej.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8a1e5414ca334c680e230c49612e0828/nuwabavulixak.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/34335283253.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/fekanugonis.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/sakurozeseme.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/56829997628.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/12870278014.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/95914266393.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/nowezopu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/af315ea43a44e6513add6af2d4c967c9/mimabopixalizuti.pdfIn PDF document text
    • http://kasargod.net/uploads/file/87566088476.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/rabuwunamapimiziwifo.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tefivinepalilup.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/xivigufelu.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/tobatujubedikegovafuguxa.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/bosakefetoxo.pdfIn PDF document text
    • http://centrons.com/uploaded/file/559479553613cfd24db7b3.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/98018243429.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mawirezudipokodedekem.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/gonozegozovexorepa.pdfIn PDF document text
    • https://adci.vn/data/upload/file/60325838912.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/xopasapuxovabit.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/lutegesi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c250c8e87---gaxumaxowewobemukujafi.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_off0000bbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 10732 bytes
SHA-256: 5b1dc6d8ac280da7f3722fcc1b3fecf899e7a01d2ac9b34ac0110d46b21a0ee3
font_02_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 16996 bytes
SHA-256: bda3a1705395613c6cb09b142f2efc603ae3d3a07387b49d3f472c0dd90e99ad

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