Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c462b413ffb9a1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 21:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3203f0e9b53294d6ecb7ce54de814c13 SHA-1: 0873a50b80492a0e1802506b903852a36fac9151 SHA-256: 98c462b413ffb9a171f9cedeeeec18ec8753ee95a466bb624bfc3d3a5cb84905
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. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://actlogistic.vn/upload/editor/files/61280172874.pdf In PDF document text
    • http://allaboutdowney.com/userimages/similu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1aff11a9d---40072902626.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde796fbdf---80006414473.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/nonux.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/59031665104.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3950d6750a---wudexivegisesi.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/saliferasakodalefeta.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/56470284431.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0679e7990---11836807373.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/12662463583.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0cf9a2655---luxaruwewenenalurunosoxa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c8d059c053ac51c6d68a4dcd6f35e1c5/lalawutiruzupoxirob.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b0d139b2---tikesiwowunugaxedopojasep.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/71867272710.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gomutavelaxazefikez.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mugadakexazagodosojuzep.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/7815559230.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/26361071444.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/laturawux.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f60267683---bikozusomutigabaf.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/pexawusali.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7c561f0b---jikedijajexapadoxesona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=projectile+motion+derivation+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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 21464 bytes
SHA-256: 2845825358bbd53f00b1e7768e0a6f1bd178134109e32a2295717f85459eab10
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 10812 bytes
SHA-256: f55102e63a22878d24c2acfa0c569a735e8a58d1ea8ee480b240132bf74699ef

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