Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cbb6850163a319…

MALICIOUS

PDF

87.6 KB Created: 2021-08-28 11:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 192c21d4e103a9a0ade174afd103b2e4 SHA-1: 087ebef05606d9a7649c9a422ff2ec88543483ca SHA-256: 27cbb6850163a3196777b2d134d2de7f5aaa5f06b81eb4e4ca75dd4f0587ce10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous PDF links and the use of UTM parameters suggest an attempt to obfuscate the true destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ivelinabozilova.com/userfiles/file/44240578826.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1da8d810---tuxobagebatatajemegejuxuk.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/benunuka.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2d4ea78c---zevatobenatibef.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/ziwedobasutemimesag.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f8ca7a628---18329492687.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0567978ae1794825b2309f58835d005f/fotifobajugusex.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/13299400013.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/75357027164.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7b967b4ce58954f5d72f204588f3e30a/mivisaverezaxodidilep.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/03966793aa098452e42b025b810d43a5/51066029840.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/37763703048.pdfIn PDF document text
    • https://digireg.ru/upload/sudininal.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4c55ae69---nawefon.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/79113643121.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/limawuduv.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/porupadujeno.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/236cf83482805a682bc3405574f1da33/41464133971.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9d8dc4a1---winat.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/42555248032.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/dexojosasupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=crystal+fox+on+in+the+heat+of+the+nightPDF 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_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 18672 bytes
SHA-256: 65da6c1da0826bf4593b9ace9076696ccf9859f22848dd1dc668f1d608ebad84
font_01_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 10740 bytes
SHA-256: 0297e7db7ee60a6c91a470e305b0852d7abe7265a29690fbd90b11eb78ed6708

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