Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d29833f9358041…

MALICIOUS

PDF

70.1 KB Created: 2021-09-03 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4ba19475d228ba50c11e2b97cf4c246 SHA-1: 5a644d5dcfe454a74a9ad620e62dac417e94de97 SHA-256: e3d29833f9358041a5f58bb286ead28b92a4c85e610b49ecfdd397f9e0146096
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=annie+besant+esoteric+christianity+pdf PDF link annotation
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1865c3564---59747421051.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4ebbe7946ba5599a4211efd384f8d567/kovesufuzosurubopowexon.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/91295523595.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba59ee008---ramut.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/rexoneladatekegazixexisux.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/49543142465.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixobi.pdfIn PDF document text
    • https://khanikango.in/file/23080208404.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/pemupinajilin.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nejikexebesubo.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/3802071892.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/57120486038.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/forokufasavavifikip.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610099baeccfc---bigulez.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/fowizo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae833494a9f---68474377158.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/13507200533.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b0124225f---vulujutavubaxixokunup.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/cda36c934c858045a7bbd747afefa6f7.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pedet.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/75998627134.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/86192208358.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfv30dqijnhas09kn3vcr8jm63/87759906818.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/45281267803.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_off0000b195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB195 15504 bytes
SHA-256: 80e2505d954169e8f31e88557c546613dc65eb72beff1066e58b631b3c9023b4
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 10908 bytes
SHA-256: 168a544fadd08c5b08e4063936851a90ff641fc85a007bc2a849d39d15ab61d1

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