Malicious PDF — malware analysis report

Static analysis result for SHA-256 19682ee5622f6164…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 14:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2824f759929892aedc0b5c0608388c3 SHA-1: ae12f4aa2419cd41e50760cdf73516fdbd20be31 SHA-256: 19682ee5622f61647192c5b4066271de0652d694da5133acc97886d0b3cdab27
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lr1qjh00k68c5gu2n1ai9c9s98/82777159460.pdf In PDF document text
    • http://originalcheck.it/public/img_admin/file///zezepemuwujomuvabozesedi.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/cec71b84a7ca2b9e750e201e186f1dbd/sejurovojad.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e8riuhvr1fk42v9k1rqrftp3k1/84613394961.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b7e0eef3cec214e14fd986556622a86e/zojubunovofawapaka.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/fa751c731ee1036a32026335f803c54d/52450937473.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ranet53ntj72t3nuntsglco4c5/94830060271.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/solakagimorotaxoxibuzod.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c32f190cf2db8a3bab2ec8834dcf436/tanoremawagurevalozixem.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf68b2fb0---riveputozezu.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/44368397213.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/lh360v1hsigvt7lkg8jgb32nin/89586747980.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/5826018938.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/judokidafekunaleraberuvi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087d93789d31---48031137623.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cc0fb700a3409bb82d67c991af62d15b/75036699239.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/o6o5fq92jonj1dqc65931cme9h/raliw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/64fa73783b594e95c1cfbe2b0d4090c5/solegifulutusajigoxedixo.pdfIn PDF document text
    • http://surtek.biz/image/files/20150121_225845.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d351dea45af---57193164218.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mopakedamemerowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=difference+between+brightfield+and+darkfield+microscopy+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_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 18208 bytes
SHA-256: 7f4f3685953f5d0bf98fdffb8a9a023c84bd0331583953dda7d48896749b2192
font_01_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 11500 bytes
SHA-256: 934313b9a239397dde2918acb657b4da028686c40dee961a393a5bd57b1cb2b8
font_02_sfnt_off000149d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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