Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09352123c2c5e32…

MALICIOUS

PDF

74.9 KB Created: 2021-07-06 18:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b58d0f93dd4520d4c628fffe612fd8b8 SHA-1: 6afda99ecc05212b2cb79181b89d5c3195055334 SHA-256: b09352123c2c5e32f983f257ea39d4543f3123701fc86d67be62158b3f1911a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous links, many hosted on compromised WordPress sites, which are characteristic of a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qi94oc47vchu3u5s6rvuam1gh0/38592975887.pdf In PDF document text
    • https://dailyiat.com/html_upload/file/semil.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/vatimikodof.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30816e4280---10739510600.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d0b16d539b57c71142c8ad390be2809/wovunu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051221123076.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/05/file/20210605_235114_173.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753555454e2---33908526180.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a4d38f70fc20126fd9f46fe91556b30c/molabomorizotoxedi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7c3f1afe---68752866840.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/23421425061.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/81225513033.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f620ac8c0e4f5e267fda41fc69bf5f60/57279873280.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210606235512.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d68ec486---86656173237.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609413c1946a8---zaxifuwir.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/971d30c87e85d8140da93cc0e814d65f/46697066143.pdfIn PDF document text
    • http://bwc.lt/i/redamurakawukebezavavo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4baa1e96---mujovokuzakagiduvebozopaf.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d186cf54f---54764339556.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dojaporixabiro.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0b44d7f774d0326d1452ff196c22bf40/kugilag.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/brvpdnfhf6n8f1lp7btnb22rg1/jebarabiwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=earth+in+french+crossword+cluePDF 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_off0000c2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 10744 bytes
SHA-256: 5f1cbb76501259daa8593f618209fe8332df2d3dc1f78e84295084eb11d10f8d
font_02_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 16492 bytes
SHA-256: de5925a1abeb266714615799285e6e61b2bf1d1c79a9e75cc9d61aef2f873613

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