Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8721ea0bba4df4…

MALICIOUS

PDF

153.6 KB Created: 2021-07-02 13:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e33105633814a0656c0f5aff33e4b35 SHA-1: c070a904ff7d6113ae19319a1ff177ab0a96af48 SHA-256: ad8721ea0bba4df49f8f99851b1c3924977d1883dabf52597743e5f81c9860ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca476e9b3b---fojefinizolifovusi.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0i84blvis0as0dh37gpj4cgnn6/demamutumemupedako.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/83059729554.pdfIn PDF document text
    • http://esistore.be/userfiles/file/55279557071.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4baa4254---batasosasidal.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/98613537761.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/76811888194.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f748feeb---18754239341.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ha7epq88ouhe47n7fgbdfm59dt/77444078021.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/zidakazamen.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e97b3e789---tiragaragamaxamax.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/18448636494.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e62744c22---xizizijawo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/85f666c12d7358a328c24e5cab469dd5/fafixedekoperola.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d2780a28---jigulevunaneza.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kebof.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825be51a1c7---91960443468.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aba11097f5c---wufojaju.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607644d6085c8---66277053131.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/v6m9eu0p2asgk7g5pgim67bh7k/serevudigixarujoxule.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffdb4b6aa1---zupulede.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ruto6eoc0sbj2r00dse3rj0qet/95872175108.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/kadirum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=synthetic+and+long+division+calculatorPDF 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_off0001f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F640 11004 bytes
SHA-256: be14d18ded7deab12a0478ad88ca62b697abbb6bbffc14f0e99849fc3ba4b394
font_01_sfnt_off00020f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F95 18504 bytes
SHA-256: e8d9da63dbe2ac775ee40b22db9b5d6b6ffff11ba8fbe0d06d6596d476a618cd
font_02_sfnt_off0002408e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2408E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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