Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f8720167fba6a2…

MALICIOUS

PDF

104.1 KB Created: 2021-08-04 08:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a86dacc022968249e822bc06c5f9d16f SHA-1: 0e2cc86a72330c7d771e8637ced153cc6d938dc8 SHA-256: 97f8720167fba6a25c8c855a650b1c8ea70cfb19531030a7cb5a4df9663c2cc8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to compromised websites, indicating an attempt to trick the user into downloading a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adamlegal.com/userfiles/file/22342190736.pdf In PDF document text
    • https://benqmusicworkshop.com/fupload/file/wotisofibivibirejopag.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/gotafupanijuvamaza.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844cd0f4186---39833624500.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fcca25779---guwukodutibuj.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/fenuzexoletikijifuvoliwuj.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/29021247748.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d5219d296e8caa2ba4f782b57b01f81/dukazoremanejeduxu.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/mazeruzebi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/6805657744.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c50691a0920---29076408053.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/84759f1e6ea81f0fe2a68e2eac0a99dd/kedodixagefowavi.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///rozumukegafajoke.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/28c5b163e5de1e90c245e10a5a6af7ae/27125879743.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84c8e2a5b---padesiripoxajujumivitu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9557d3daf0---45761253950.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826ea4e0ae1---92289087549.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/tudiwom.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/13269898688.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bubapixetisubujaj.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/73396530300.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/91439984034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=convert+adif+to+cabrilloPDF 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_off00012f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14771 10540 bytes
SHA-256: b645779b0702af8b68aba0eb7281f2172eec824a0d37f63e8cd53efc759e3c1e
font_02_sfnt_off00015f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9C 19588 bytes
SHA-256: cbf4b0863900192bc682770936ab6ddd63ce3e3cb6892d14b9df8e73dc9e60f4

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