Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc91a03ed36ca6f9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 22:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dea43553758241910cc3de705116b350 SHA-1: 3716f86c67a68dc6fe0f007f53229851dab652ab SHA-256: fc91a03ed36ca6f99d52f0dbdebfc1ce8034da585f3cc9088f60470807deee34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/922cc6c5tu3nb0dkj7b5ht7k35/8439420888.pdf In PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c222724fa---defixi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78cfcac31---betufupik.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/43102457503.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/33266996275.pdfIn PDF document text
    • https://kermanrooz.com/img/files/84389558175.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/zinajifisurosiliwabuw.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb9354041---gujagepugemotonebuvetox.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8ec2206a---liwatarixubukunujak.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/766bac3983270a7cbbddb421e3ed770f/suxinadizoladufolenatejig.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///69038077449.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/maxivobosabivineba.pdfIn PDF document text
    • http://imbirimbir.ru/files/54359559762.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/73488535959.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/sovubi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092041816e2f---98197245490.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0eb82ba09---zinaronasanogobim.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/fejunugezetazew.pdfIn PDF document text
    • http://www.bash.cl/media/file/xidetuxumazonupufowi.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/woxoxepefafelu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/jidesusezubevunumuvav.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/geguzuwilafik.pdfIn PDF document text
    • http://89928386.com/uploads//files/202108041641298253.pdfIn PDF document text
    • https://expomediainc.com/upload/file/91759724716.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae327c6dab2---89536409569.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/gibivozezulusomawefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=capital+letters+alphabet+worksheetsPDF 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_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 10596 bytes
SHA-256: 6a8b92ed80c827379af23ab20d68845d7c2be1b3b9d3da5a9627c4c4aa20c6d5
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 20404 bytes
SHA-256: 9a9087b780d7defedca4d9d40cdc5e9232ea78123f0c4b0c0aa94c37b1b69a6c
font_02_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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