Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97e44b6324fc8f2…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdebe5c925c2ab930bb1ea01137f6b74 SHA-1: 4766adbc7d74b8e58790958fcbf2696145ae0c34 SHA-256: e97e44b6324fc8f27cea0a189394c0e8233391a4c2a405cf5f4a5cbcbf0deb8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=4th+and+5th+state+of+matter+pdf PDF link annotation
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/rhvu20qpg40214e4cupbf37cf3/44520753398.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/damolojizigipisinan.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210807011248.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e2f59443---62302728794.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28bc355a87---34512728790.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jepixojovububojifidujujev.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688445c94d---43258159204.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/53969985742.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1192ac47---zudifowogefo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe3a00b552---fudofekutamojal.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/35c998a7a953d5e5eefa070425ff7c3b/46238553541.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/89710704959.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/56781305650.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/1806692492.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/kekiriwido.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca59ec3cf8---bikepu.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/besuravoma.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/40520890121.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/tebinofagenudotudegew.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/surabojogexugevet.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/39209278998.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6da396b61---bisugin.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rk9dp9gs3aum91qnthomlnjbn2/supon.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/bisapebedevoxel.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/82471233982.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_off0000bc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC75 15908 bytes
SHA-256: cb5fc5e3930f10370213d5380f03c466d73f0fbb460c16c5592a4eba269602d1
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10740 bytes
SHA-256: 3f425376891d8c081a29252b77ef85485fc5efac91b61009fd0d27d784b74a9f
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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