Malicious PDF — malware analysis report

Static analysis result for SHA-256 2611497c2f18e771…

MALICIOUS

PDF

107.2 KB Created: 2021-07-26 09:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 951312d3d10da83e46c4ce48717538ea SHA-1: 81a4f366f43622f66a9f22fb4e2d022d60a7e6f2 SHA-256: 2611497c2f18e771034c3fc10503b02d4db4bcf1206adc50f37ef184ab5d1faf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as landing pages for phishing attempts or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f219b7c2---32847053573.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4hvuhk0kh2vg4r9vs20mpg66nh/74212828222.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60e4b3f2e5868.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/jarawadozidanitabewowegar.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210609133200.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d9f7e036---25051952649.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2f7941a45e2570f6afad7d442d25c326/11514267744.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/zisofenaru.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7hmvd9ndrkljn6miisk559pgcd/katatagamoz.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/sfee0eub10908fejkjmabpe2qn/90381474079.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/14080691670.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/79349739446.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076743600f1a---65364615243.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/67935847848.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/mogekigepovezos.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98887b5ee6---85221238902.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c227664770a---koxobowowurolodorodazev.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/pegegigotiruf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8bol550m9fj7g55tgpc897if81/90473677359.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e9e15a14818c7e0c2ad6485bd4b21318/xurorivad.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/zotubegimepudanexiba.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/zutilogenetom.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/48518859190.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/tuwugezunozesugosap.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c5a5a017d---gixisijorobewufuxarugu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d420501a---fujanubemuvukuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+are+non+flowering+plants+calledPDF 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_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 10976 bytes
SHA-256: 526d1a6b90da8afbac134156b88d580cb6539ffc66fe2dc74048e5cd0a12eb07
font_01_sfnt_off000158d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E5 17516 bytes
SHA-256: 17072e56a7cde95245669db33897b5c1ecaca2d4437493b18cb20c55c763c460