Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf0515b3705491b…

MALICIOUS

PDF

83.6 KB Created: 2021-07-18 04:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 264b11332f2b41800101acdce9612fdd SHA-1: 5d9ce78c1f6826fa3d9e44a9b693698446fadab2 SHA-256: 1cf0515b3705491b5d3b174d746cc0008b07f909d6f17808d527e942cb8a06e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to potentially compromised websites, suggesting a phishing or credential harvesting scheme. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these external URLs, which is a common tactic for malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/dexegusuvetufo.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7o539bab2v8gkji3e6132nijp1/61452744270.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/94758851254.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082851f8c565---migolonone.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/49307069334.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/227b35nrddeob9gcnnevfm3q71/81878696059.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/13715077004.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ce8f8753814a68cf45b92dd3f54e63f3/29204312075.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/apqdkiamtroei5ftqks8617iv4/79442661596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0c848258---43957069924.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/61085731562.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/62139187969.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0c78596af72a655e3855ef51cb59e603/derejofegobozasanoranoze.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/60466297310.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23470887b4---85352142786.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8ddc82f269517c1d67f430ec7b0f861b/34953832044.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2fccda9b---27552511571.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/remidez.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8f70c6dc78eb8571ab58c71693a15b5c/zubadulozonejizowot.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/5c61f147de2e5accc1129522d3650ebb/waxazopilonotufoweporepim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db88d9f706---14434196059.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hlpvjcn2evtgsf3vd8irig99c0/dusakerovaxer.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/4238150705.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/29a74a692761508be84504de7d38097a/warevamemebetinoxukozowes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=treble+and+bass+notesPDF 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_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 17112 bytes
SHA-256: 69a492280214966aea00ca5cb9381780a13ba65cef2bcde2ad11a0f73b14635f
font_01_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10252 bytes
SHA-256: 66756c514bf8037bb7e274db011b1b04443cae2217f9eb344a1ad11a85f94754
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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