Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be2d180147729d3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 02:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2e24d337c0cba359667e497049f755d SHA-1: 7c182ebb79dba360e1699752afe7f5c16618bc84 SHA-256: 7be2d180147729d304a11e68528f7faf2c4f194401cc2dbeb2b006bf91b93b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to numerous other PDF files hosted on various domains, some of which are identified as potentially compromised CMS uploads. The presence of multiple external URIs and the nature of the linked files suggest a campaign to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sealordhotels.com/ckfinder/userfiles/files/tirokevasedibixuzebeviv.pdf In PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5f5339d8---89786185955.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jegupubedoxulabosi.pdfIn PDF document text
    • http://afslab.asia/upload/files/nibetivinagav.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kajofitapujiweliz.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/23015861518.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/26420469477.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109140617167290.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/96445178599.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/38151553185.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/kusoga.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/nawijag.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a4832810---dudivezeled.pdfIn PDF document text
    • https://expomediainc.com/upload/file/jazekopudawezibule.pdfIn PDF document text
    • https://renteci.com/imagens/file/78701468379.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/kafezakosuvibonividukojaz.pdfIn PDF document text
    • https://ottopianos.nl/files/mefexifefunejerusiwewomof.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/xomuxaseruloja.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/67182098872.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136011649a13---nazogikuk.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/39203512608.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091000360848.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/danorewezinowemi.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/45119720009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=theotown+mod+apk+android+1PDF 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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 20016 bytes
SHA-256: a8b3bfa9cb3b12434712fe156e1e1355782fd7d782218622fb7eeb241a361f7a
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 10636 bytes
SHA-256: 09867540899ffbb7a0473b55d55cdf75225d79a0579c7bad214d985a751646be

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