Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7a9ca287f4d334…

MALICIOUS

PDF

75.1 KB Created: 2021-09-07 20:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90cab28ad438d7787272e8ec7d7433e5 SHA-1: 097282aed5d07053e0e273c3a8b0c2ee75d905d4 SHA-256: eb7a9ca287f4d3347f9c5601703ccdfa5e243e8b7093dbb6fd2532c6315029e8
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://rauvuonsach.net/images/uploads/files/26231883067.pdf In PDF document text
    • http://asiavent.com/UserFiles/file///dokusugofevatusadewipimot.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72cd95957a---73023422933.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/36782083823.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/fuiaa33bmfe4fmdv9rmmm3ef46/51952561115.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60800a28c9---96569009309.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0518837d6933ed54adf8567de4924937/gimarijasog.pdfIn PDF document text
    • https://kuepancong.com/contents/files/75547790966.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/zajunobugoj.pdfIn PDF document text
    • http://leguido.net/files/moxulekofetov.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a5cc82fd3aa7b197b1af106542c7454b/wuzapefipopolonubomute.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/nukarudopatifizuvuwi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/09af89eb95ce4afbaedde90f1e353498/68726718325.pdfIn PDF document text
    • http://strandedtattoo.net/file/gebarezejewekore.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/wegidokipobezonubozewuxo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608808712b26a---zitumenus.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bc573c5ae---95618468593.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4dc4b05f2e1fe164506aa2a84852fe7a/76130363959.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/83163422047.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb66b136e4---kolamifew.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b7622f4657c31c04051599408024f7c9/zobufefonerurigexetuzusil.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/7781569434.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6f8edf89---xuwojuxezotubazevafeduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+construction+and+operation+of+clandestine+drug+laboratories+pdfPDF 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_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 11104 bytes
SHA-256: 621488b1209ff2978fa274a057ea0c36e8fa7ade5a0677ac96a40d540e9911e3
font_01_sfnt_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16284 bytes
SHA-256: c4553219e301b02061ce6244980ceb1769ba2ff9b1890597039973bc0407a45f
font_02_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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