Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a5d581fa36f6f0…

MALICIOUS

PDF

101.8 KB Created: 2021-06-28 06:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76b833a2ebe8a65046d2bbd4bccbc94a SHA-1: 0a430938743c03339e378714686abfd0684fbf98 SHA-256: 18a5d581fa36f6f081b454c37ee89d3adb3847ae06a57784df56ecaffd5668dc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://eastmanllc.com/ckfinder/userfiles/files/68768489673.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893a3db720---xidetilis.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/123g6vcmhq3flofmfo0ksf4qk2/55684982920.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/52937840695.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/36546189345.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/30409711558.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/lupigifikoxur.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c931153b---67737767583.pdfIn PDF document text
    • http://esistore.be/userfiles/file/92125460326.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d795213f---kobulokujexisegiveviki.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b71fd38bc---nulatax.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b4f488f81a5c7a35eabe321d082759f4/64430931795.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/resilawanajasegitodefe.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fc5480adea5ae114fa11b332b8e4d5bd/babanoxozamup.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5fb4a92f2cae22d6462c17eb3d02fef4/19333015739.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/4517ff0797aca376312582f28d5eb292/luzusafasenugisodemojesor.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/ddae818e69949a203aef3da874018ac8/39260672176.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/67629210434.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4873c9fb7---12321222893.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085706a7f831---96416728796.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2d16b2e55c7f84d6d940b2ffd2044a86/99597235279.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507204703701.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b0568ad7495---dosagikokowapotazujeluzu.pdfIn PDF document text
    • https://rosycaffe.com/file/nezononiliwopuxatenumalut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=limits+and+continuity+examplesPDF 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_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 10848 bytes
SHA-256: eccc569e46fee7000a006a9c848eb7c0c009867069a4fde5b861aece7ce5d38d
font_01_sfnt_off00013d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D26 19756 bytes
SHA-256: 085970a0aec064d78224ef60c3546a782c82601a9d8647616c6c2c4ea9bfa181
font_02_sfnt_off000171fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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