Malicious PDF — malware analysis report

Static analysis result for SHA-256 8486d0723b2bbbdf…

MALICIOUS

PDF

96.9 KB Created: 2021-06-27 05:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56933de10cd9660747af0cb63c0e46b3 SHA-1: a0a9afe073623689bbb8add63479baf0b0e203ea SHA-256: 8486d0723b2bbbdfd8985fc0c200d76ecb771070c77e3ec7eea9aced3c714d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the structure of the PDF, which appears to be a link farm, strongly suggest it is used to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bbf57014a---548953843.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b702b6792a3---zevapododajenekiv.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/bns9g17qqe88m2ploaf283ridh/mosiwefelew.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef35757e6d---23091844455.pdf
    • http://klpa.net/userData/board/file/89588363839.pdf
    • http://bptramptour.pl/files/file/vaxawuvolexuwu.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2e2fd11c8b24759dd840ab44c3074afb/71017848159.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987cde506e8---1888530802.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9d61e1b96fadefed45471e0977872aae/55420986313.pdf
    • https://coastalstudio.com/images/main/file/jinadifederamijuwuvulagar.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/677d669444dda843cc0e24efbf966243/39622786750.pdf
    • http://dynamic1984.com/user_file/file/ludonelusulopevuvu.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ae6868351c89052d14405427e6bee60f/45815511590.pdf
    • http://champaigncursillo.com/userfiles/file/53317683399.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607754d47f979---16686495119.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t95jjs2g92g3r2vkro157qd2rh/mefiwakepelumasukob.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mig2iqil31l2gu5qfblb72gof7/64671265179.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c83c8b744513b9b75b88def98a19d9b6/64831686654.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20d8d5fac---55709835522.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddb066415b---lowikidetoferudakokunuw.pdf
    • https://betenagro.com/sites/default/files/file/33044820444.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/bazigibatiru.pdf
    • http://patroha.hu/file/lenemul.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fab2622a0f---49127252563.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=public+speaking+for+college+and+career+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f5.bin
06c2eb4c109d0daacca09196565e515116c95f5b832903b54dc67695ac7fd290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 16496 bytes
font_01_sfnt_off000144dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144DC 16792 bytes
font_02_sfnt_off00015cf3.bin
ba5eb9eccb8c6fff359b7c65816b281acba78e4bd070fe4b68c3f8bbf9c11093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF3 11028 bytes

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