Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4446b7b7edeceb…

MALICIOUS

PDF

97.5 KB Created: 2021-09-07 21:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d11c233f4bba7fd485e3c9530635d9af SHA-1: f2984d938c84e5c4b59c6058030e99b81449a2bb SHA-256: ab4446b7b7edecebaf312b5735e77f6994bfbb2a3acadee534ebb7de6b87844c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely leveraging a PDF exploit to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://constantemail.com/userfiles/file/1625204519woroxox.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9e0cab77---78723866037.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd7ccd6d2---rejufekofumaramapovika.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/zibizawukituxezu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624481237.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/dedeleva.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f5dbc4138---verepitidepinidurikibe.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7863c59e49---wudipe.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/fopusuki.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/suvknr0aifskb3khok79iie9l7/wifebafemijamodow.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/bijosibafezomuvug.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87874129707.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bobibazozajuzupovogis.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/binarijadop.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68181900f8---xumiru.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beebf99c982---75278346137.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160819741d86aa---80099191761.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/benit.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/12cl8if0tsjqlqed4h2hipic6a/63328463610.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/66349297760e4b5f7a14bf.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e0977bfe374fd506f4af64588d90edef/58955228578.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/rudokewosaxadana.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/viperijuwetozifo.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/kisilonifoguk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=despido+nulo+peru+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_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 19120 bytes
SHA-256: 4338a556424f6d710740554a3925fd2af6335690d4cdd4b4d84cd25e41929695
font_01_sfnt_off000148cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CF 10332 bytes
SHA-256: 77e783e6968d05cd7b600c905a884b017edcc1bcc5bf3dbb353ca3e40a443bb7
font_02_sfnt_off00016032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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