Malicious PDF — malware analysis report

Static analysis result for SHA-256 109c3538c6dcb0f2…

MALICIOUS

PDF

78.5 KB Created: 2021-08-29 23:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ff9990533ae0bfd3ef59d3ddc0725f66 SHA-1: 4a926481cdb95de84cf400324337d7c5c3ecc975 SHA-256: 109c3538c6dcb0f2caf4776db51507a0c2905438c525c37ee9f32e4dcedced26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm pointing to compromised websites, likely intended to trick users into downloading a password-protected archive. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent of distributing malicious files via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608529dc8440a---64825346944.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8e15aa65f3532474aefd911ef3a98033/sixiferamevorovuvas.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/90673330424.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110d933d1fb9---tozelirifokemi.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/nevigogotejid.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859bd43a8a---34811968235.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdfe0ca3f8---79474162888.pdfIn PDF document text
    • http://beateromer.com/bilder/file/40955029746.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/sumofufefawu.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/71520142095.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/sibuduvedugizovonugoz.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfe07199a---rilewori.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/9638872180.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/74838977714.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114bf899fdf5---biwaxogakisa.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/78223794330.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/94c3130c84275d1cea4c7753687c99d5/37340441624.pdfIn PDF document text
    • http://axwelindia.com/uploads/58922461871.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d2ccd96a3fe4cf0ce1caaa7b5913ce4/41620548020.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/gadogujusupirafuw.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/ziwevom.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/f5a4b744b06b820a2e28425c5aebfd82/tezaj.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021823188466724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=song+river+of+deceitPDF 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_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 17492 bytes
SHA-256: 25442144798b326e7677ff8bf8f9aa51f7ca635b863bd0a4ff736f1186ddd899
font_02_sfnt_off000113dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DD 10416 bytes
SHA-256: 30b831ed1ff26ee47128aff9a7af05e5d30bea23ffcc9290e616d28a06deda51

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