Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcf4a54e8d14699…

MALICIOUS

PDF

111.4 KB Created: 2021-06-10 10:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1170bf273ece9b5b829add6528df4b00 SHA-1: 4f7244b039b11b5a49e2484ea85a270224787783 SHA-256: 8dcf4a54e8d14699ff2349bcda51b72f6ea1c55a1a0c3464b036fe3168be66e7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=percy+jackson+and+the+greek+heroes+pdf+download', are likely used to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/uplcv?utm_term=percy+jackson+and+the+greek+heroes+pdf+download PDF link annotation
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da76bce9f---jigexisiteloromupofewi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e67e6ae9eb3bb6d612e716a55aec580f/93986620264.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/46b4a56f138f43b9f058548867d90e15/13557204490.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/fuduposofidevesajazunig.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fqervokgbhlfndo1ij9hbu98kp/27971555282.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a4042be3---vobotixukebi.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/10855090764.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/lukaditol.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b5617f90---77263935414.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c223469162---luduvazifefaf.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aa2b5543---97801439859.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b87538b79---73896465978.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/gavojul.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/gegasugubopufur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B1 5492 bytes
SHA-256: 99cce2ee0757485d46bd3bfe24db5c13eea72d1aff0a6bf1000b9876d9ed447a
font_01_sfnt_off00017b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B7B 11448 bytes
SHA-256: b0f1702c094fef369b5a498cdd095cf71a830b9f6c5e438db4bbd7e095826ec5
font_02_sfnt_off0001a258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A258 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378