Malicious PDF — malware analysis report

Static analysis result for SHA-256 d935e2ba011095c8…

MALICIOUS

PDF

93.2 KB Created: 2021-07-26 12:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb50b872436a8bd2b3730e6ad93f7df0 SHA-1: 65db21d42894eeefe39fef40be6e5291e756c02a SHA-256: d935e2ba011095c844c0d456f8f6db6e9599b4edf31fbe32b1649d06baa1028f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or redirect to malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://eccdc.org/application/webroot/userfiles/file/45899421211.pdf In PDF document text
    • http://chinhsuasolieu.com/media/files/kegesetixeduvu.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/80197908173.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ee1999617db029e4b863e2d63b9adfaf/85755949874.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cdca680699ba1852fcf500057e453b59/22980885328.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca125a61ea2---61662931018.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4e470245e---7667226183.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdvo9ikucuvls74bfc1cdnm30o/94822420719.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b4b6276e3628976f4279a3ce8be72f59/vefuf.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/tirufewatijaxugedaviza.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16094230606b0d---kamapujugowanibonobalanu.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210701190521.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/gid6g0kqruddetck9cg9dk9kl1/wumewekolimedag.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/xomif.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092992839e39---45970437765.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a086a72d44a---27653950111.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/78680628528.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f35b61a54f0c42ff37b0bb385b3dd64c/27174270309.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/kuwemutolefiluzaxokezimem.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce893d8e6c---69549952967.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/misetojivaregadejavupepu.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xulukitivukazofoxipoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mdcat+2019+result+checkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 10800 bytes
SHA-256: cd872b586da73aae32cd20c7ae4683a13677fa370f5843cd39ba90ae29d9d2cd
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 16392 bytes
SHA-256: 9332770c703c26dadbdd44fc997f33cf40b223e295b84207daf8c1bb586b6556
font_03_sfnt_off00014911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14911 18424 bytes
SHA-256: 392e8a1471f9da113de22dfadb8b84e44d217ea986b519009b51a0068a0a7a1b

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