Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d230eb435aa20ea…

MALICIOUS

PDF

105.1 KB Created: 2021-08-05 16:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1d46bacb5fba1d07893699d3a0473149 SHA-1: b02b96421d13c013e6fc829e7bab8f90ea862421 SHA-256: 4d230eb435aa20eab96420c0e2fb276fc78a7b831f2b5b37842a435a4ccac1ce
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=juegos+de+motricidad+fina+y+gruesa+para+ni%C3%B1os PDF link annotation
    • https://s-serviss.lv/userfiles/file/6007183304.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/tixedikurogipiwisafimudiz.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/2501153245.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/tebusoweja.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/ganumokewibagigez.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/venefafetelopawu.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/76271784151.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/30351416694.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094c616388fe---18879074021.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/17feebe36a3fe4aaaa9bd9f5dd749c97/69528536435.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/76884979354.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65e30c2cb8---lonimenazusolikevab.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/g7bie4g1m8c5qfmtojqc27srk3/juxumalesiles.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/11222079955.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/74597506565.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/90120614661.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f013d240d8---nagokepurajukewapekopurok.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/56572672898.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/r6hm52o5n6tn0436kj79i7ggrh/rixefoxugizimokitik.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/fozibomilawefadenege.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607826a555638---lugeke.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fac7752ae72adc0d1dd95022c3f4937c/bofotanepuwuximipidazipa.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/sefazib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 18172 bytes
SHA-256: d4b59fd7d31e45374fc49a5d409a49cccf4e723f7bd7bb14bfe962404720d0c0
font_01_sfnt_off000149bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161CD 16852 bytes
SHA-256: c84291a86e93994e2db0026b942a06cee4ce2c0ca8df5e9952d0b98187992b56
font_03_sfnt_off00017945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17945 11328 bytes
SHA-256: db6391f9dd25b05c61992701a86d59372aebe4febba9f11b349def9bf0b2fb7e

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