Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7be83aa8a53b45…

MALICIOUS

PDF

77.0 KB Created: 2021-07-01 17:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3f34db00ba7fbf1c01ee1d59a08646f7 SHA-1: 034bc1acc8a33523c6fe4301996983d78ed4b45c SHA-256: fb7be83aa8a53b45f453c28b61327f34a62ddc140f305d4497046a512c59d6a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, likely to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2967e7fafc---ribezolawu.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc66ea088f---18420502192.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/flo1hv7sr3u3re1gsuo7p75cvg/rolijefefisogo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2996eeff69887cf65fffd72d4a26b46c/ruwunefi.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/83444056524.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/25164445927.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/14719507133.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/8iumkt900su2a8as78qhthvva0/48902035828.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/18vapni736fro194mhuoe84r5f/putogazoke.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0c8dcd6e---95429207753.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5ce31c66f65f27b6a9d1dfb6e17922be/bezefenipeverati.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/nevanipufovus.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/45190736756.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/domiru.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/89872632080.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/fidikixop.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/puferamapob.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/48256391976.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/benazejafefemedagolizur.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/jejeb.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a492c138a---xivosumopafilekowagov.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e331132381---bozawuruviwabasanin.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec78c5d190f99c8bfef364d5695536e8/nelekevunebudutara.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/sodoruwosikut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kingdom+of+heaven+full+movie+with+english+subtitlesPDF 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_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 16624 bytes
SHA-256: 88516298c2f7a0ed3a6d4741f7c3dd84f36d2895063a8153814574d352661383
font_02_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 11084 bytes
SHA-256: f29b3d24551206167bd5f5fd033e76499c318f72284e6ce7a31283ec32457c36