Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39ab4c1755205d6…

MALICIOUS

PDF

99.6 KB Created: 2021-09-07 23:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b24481f1c78e62c48341dafa7d11a808 SHA-1: bf0f7d5f1f28097fca5907598afc2ce05126f1d7 SHA-256: e39ab4c1755205d6bda2ee7db66e54d8b71d666c2b7fafb0bd4e30c592e80b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=humic+acid+in+soil+pdf PDF link annotation
    • http://madmojo.com/fckupload/file/mekasipekibutem.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c8f13394---tivolipewozexotijulu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e141b885ce9---24728963550.pdfIn PDF document text
    • https://digireg.se/upload/tupowumuputifim.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2c82db5e8437c8f3693717435df17ac7/38328269856.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowobijot.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/80866162986.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/tidanoloni.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/isggls9s292ihjk4g9hfmiqhpr/78622906059.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/60g0sfa8kjqucuvmp4quoj3rgp/64744597503.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/gupuvobopukusijofizonoda.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c52137c709---sulife.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/92937734213.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/nusopobejul.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/07fd7bf941bfc06c20017ca195ae97e3/gegemuvuxopovabokibu.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sefobebudapexojinup.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe54d199e---lusoneketasu.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/32100584670.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///28098832369.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210626093011_m5l19p.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f97299e4c4---7244837049.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t0hfqp2jat2s7lr32f7gef28iu/jeturajosovote.pdfIn PDF document text
    • 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_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 10540 bytes
SHA-256: 98fc23992fe559599fa58b2d1be29f55313d8914579e2d167b1fe14e0f2f24e5
font_01_sfnt_off00013525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13525 19804 bytes
SHA-256: e24dbbd3e5ef6d34d31b3c473db74e513c63face79aa77469a29e1fbe8e50789
font_02_sfnt_off00016958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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