Malicious PDF — malware analysis report

Static analysis result for SHA-256 b275cfb4a3a8d7b8…

MALICIOUS

PDF

133.4 KB Created: 2021-06-25 22:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c1a41b1d3767e8e0ff0cd58b7975d68c SHA-1: b836809ed42b1ab8d633aa8ca931e8d3bc738ba9 SHA-256: b275cfb4a3a8d7b821246cb511aa6039792d3c0720a3676647eb46f863a40399
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078976e57896---46504725206.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c5n12g154n8eoec0olc686ki52/20354782385.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/26076529616.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/6bc04361c2f16ab4c9a77c9917171f3a/tosukibopaden.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ad40b0koclmt2l0pisgbvdj8du/54381978806.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/25560526567.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/69969267333.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2b1d2a2d---zaxeg.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8485c412d0fd591b68b37a5c7c1f7b11/soguziduxuzufagipo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160946c3b2f892---ratodevajiwuf.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442d6ba0ae---56589681569.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jflea6l29g89ge66vktm2nn0hk/10262753896.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55cb98424---runinugen.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8d2db218---83703338846.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/gutasusamubekiwoxusi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/812d8dcee31beba8ec067b3e42ffef55/rozomujezusekapu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808d27800d---tunelevefibawos.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/832ad6654cf87d85efa8fb9b88a1b5cf/sazirimugo.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050111095656.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26bcb41268---kugotipavowaparabisurirad.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/24710354409.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e831db816---wizalinotidej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gre+word+roots+prefixes+and+suffixes+pdfPDF 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_off0001aa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA1C 10772 bytes
SHA-256: d47d326e49e258f75697cf14adcfc05cf109561beda032f6038f3a9d04abafa5
font_01_sfnt_off0001c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C324 16724 bytes
SHA-256: ccebe1f19b614e6bbcb9daec95b64d61bde2c06b08f40d7871d1eac8ef6460ae
font_02_sfnt_off0001ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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