Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbd60650adb9c81…

MALICIOUS

PDF

85.5 KB Created: 2021-07-21 14:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 238c8158c3d2b41dc1705319a2934b35 SHA-1: a3ac0c1a24b60a46e5b788b4a9ad6b020ba383b6 SHA-256: 4fbd60650adb9c81bfd51a1df3ab5c62e679ebcaf832a960b1bfb6cfd6a89e24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://voxel-avocats.fr/uploads/file/goxipekufup.pdf In PDF document text
    • http://aquatrustfina.com/userfiles/file/57409117671.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/sazetutexebujexisidosore.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609833a03719f---titaxebesasawobatabat.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/kibebakelozarivotub.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a76917fc119af8f086e6d8741ab9aa24/228902504.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/kuleda.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/lujudume.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ccb2e4ae4---kegoleziferoxo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/52dd6e936d57f8d3faa72bf3a3260682/11040521501.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/fomubufukaxadunimal.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0bd9e6390134437e8a39cca6008e7bd1/lalezogan.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16e327456---45346646847.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0068637ce5a7546ca8510163ac7ca9e7/xotuwizukof.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969cae04759---nazesirovapoligugavujinu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/532fead6cb7c5077bd058ffedfa16ee6/rogorovorifeliji.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/tatagika.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d614294b1e---gazegugunanux.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/52342929276.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5cabc2b5---14379619894.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/59506672414.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/bigedawafofevus.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7f349b79788d0f9ce2ae6e85498176d1/falowitiravelitunib.pdfIn PDF document text
    • https://superpart.com/files/3452978199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=lockjaw+that+is+difficulty+in+opening+the+mouth+is+a+symptom+ofPDF 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_off0000e9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 17096 bytes
SHA-256: ff546978b411da57c6b94a4fafec48c4f587beb50931840722b60eeef600dfdd
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6A 11444 bytes
SHA-256: dc2fce2ee8d50acabeb5eb8e79e636653faf8da2e87339ad34a7ad177fcd1743

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