Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd1793fd7f0ab29…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 11:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0a39e5e00b04805f32b8ea66d52ceb7 SHA-1: 51f66be8d9ab9ea9bb3b648bfd7437dd2227c93a SHA-256: 0fd1793fd7f0ab29402732ea73c886769f11893ca45300c1cba9a9ead6264b7d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://amblesidewindermere.ca/fckuploads/images/file/zubatupifadikamugodoxakef.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210820100544.pdfIn PDF document text
    • https://area5srl.it/file/danusugamuzuvupodavi.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161026acd36fe4---ganofejazurukuduvononed.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/262250473648.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/nedenavuwunedovukibobujef.pdfIn PDF document text
    • http://minerva-collection.net/files/files/duxuxeb.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/foxunixinoxisu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a4e87d4842---81184620625.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/befetazimamuvak.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947b1fa5f3a---limorufojajavox.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/pijejidudinofurizuzi.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/zebirime.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a01a532abd6be3cfd4c4c30a57385ff2/tevupep.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/s4labrt6efeae42hho16iiki8l/92663022773.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/97142612458.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/nokipozefutuxu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/bugojepanejosuraremudata.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903c725df12---fivivozakonumibarofofemip.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nabudikura.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94d4b36b9---dawaborevixumomidetoxuw.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790a1284eb9---lusirutosif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=physics+lab+safety+rules+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_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 17296 bytes
SHA-256: 27ff3fb663ddbec379342598e3ae7b60076e9eba5d0cecece67ddc1f416d5b3e
font_02_sfnt_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 10848 bytes
SHA-256: f60a622caeb0f3be5fa2873b04d6ead96ca18b386d63cc31a7df71f30f4eaeb0

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