Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ae03bea8cf0fdd…

MALICIOUS

PDF

75.4 KB Created: 2021-06-09 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c58dce09f16cd216510034dfd7d56594 SHA-1: 15d0c7631098c56c8a258d7691b591aa24c9f6ca SHA-256: a4ae03bea8cf0fdd6366c52e0b980160da2244a6e907db89f3e42a90a08e0ddc
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The presence of a URL with 'my craft game free download pc' in the UTM term indicates a lure to trick users into downloading the payload. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=my+craft+game+free+download+pc PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dfe31cb64---nuxowivoleke.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/80176923537.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cac8bf2ddcb151b23879cf7972b68a81/pazobakikin.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f512a2d36---29593460287.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ced16ee36ed88c29325c6e490b11217c/biwunukeg.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ggame5q8q5ft59mv8ldaa3iki0/zenadotitigiduviku.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/287230d7348eb67e15a60c68bec962bb/43678813639.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/15f5d24c80904bb2cecc0d5670cb0cdf/31948357691.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/0b40bc81a58fe7fd687c2635061ee926/57219029807.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/gajoneputopiwel.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/98043986002.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5923f4607b1191599ece1bf9df9f38cb/nogobijujefalozuwutel.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dee14154d7---33318004536.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/72821907590.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/96005550154.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zunobisawegosij.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/58249378853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 5496 bytes
SHA-256: 6a1eb8d61e554efc1010fa106ee469278714fde00a598fa0a8a55a6cff90ba4f
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10560 bytes
SHA-256: 9c9e62abfd8ff217f656a5e6459f8bfbf299bd7b9a5c5bc8e74cff514d20517f