Malicious PDF — malware analysis report

Static analysis result for SHA-256 6038a9fa4b716108…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 21:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f01d0e65345671df0962a1762762cd84 SHA-1: aa96fa67993862b968c85c89caa18136e227095f SHA-256: 6038a9fa4b71610877b81cba119e97c5525fd90b924fbfd9ec3c328e4ec4d169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=blending+words+worksheets+preschool PDF link annotation
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/72346318928.pdfIn PDF document text
    • http://schokobrunnen.com/idata/tewidoburilezapogufiwar.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16bd176e2---79444382544.pdfIn PDF document text
    • https://fivetc.net/uploads/files/porizabapoxup.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161308cf47308b---nozijebupekijaf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m8k3d9sbh96o5f5357jljl1nv2/45498371970.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/13352520254.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/kekoxuw.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///77998898512.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/97838728350.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wozijinegalununazun.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/34bf66fa5c732c6118d44a6dfd1ca76f/nogatowubozubafo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3af89a1108cbef5361f7d2f49e581be/kupalafo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfedede769---57357299511.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jdbc4c37mgd7lpdsnsr7ebldf1/35046534436.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/18526517573.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8d1154fd---21185269915.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/juwakobopugowamojilisoj.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c325c0744---76517600731.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/m99a69h1qq6g029e4h3p1idon7/xerumapalol.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079615157e1d---21022101572.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d25a5851---bitefad.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/44448716123.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/fevenepibegoxabedex.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_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 17836 bytes
SHA-256: 00f5ef5bb31910fa5952beb198738e1f5a60fb6c020941253567242276a9854f
font_01_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 10864 bytes
SHA-256: 5513dd782f7d30877bf054004b4e0c6d6b95a612dea9d5ff8fbcfcfa415a365e
font_02_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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