Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a093b282a28d7c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 01:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0b5e0e3d1154fe9490ca4fa40be459d7 SHA-1: 99751c25279648fbe0b6278537e88029d72fd558 SHA-256: d0a093b282a28d7c45202a12cad3b53a1c86ccbb2fbcc7cd883fedeba0ac8166
156 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 threat. It functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+read+and+understand+shakespeare PDF link annotation
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/d1f4868132ce922fe819cadbc1cdace4/xidixasezawadusofep.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e385ad0f268bd9587abbf0f39539d071/91564429748.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622282745.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956b027a7b5---30711500993.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c783929e6cc---puzatodumunobowebo.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/gitebog.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab0c09d39---legunepara.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/50162051946.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ab1f6b8d4fe0e6bac4abf17fed3d053b/93757165351.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3292496f6635a9a9e4d920bc82bc7bf1/matugagekegir.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e4457dab---62794831950.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dbc3dfd674db06c8b9e1b51592c0724b/zulunijilositovexuda.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/juxujesexegosufozokepisop.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/dgk8daksuh2h35tkektgehl6sd/rudemetefavonojoton.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/ruzaj.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/bakowovafexuwulufidawoja.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a283b191---35496893998.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/51a6af353336f9a3be0649d515dab56f/96966637085.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/abkfmp8haedma646biqfiuuah3/letatenamofase.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9b48b4110916901982f55d89f644b8ff/dutekewiravujuj.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622302234.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/ubphq20tb16ovmlfsh3151ualt/29774309957.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/dupubedadu.pdfIn PDF document text
    • 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://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_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10620 bytes
SHA-256: 1d11dbabf647acc23cfa79c38521d4bbfdb28158937b2798d63c1478f6c1aabf
font_01_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 17092 bytes
SHA-256: 03a30d67f515fc1ec86617c44f0d934cf71569227a5da979936bedc38a13fce4
font_02_sfnt_off00013e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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