Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68b7c88e1a3e1e5…

MALICIOUS

PDF

73.2 KB Created: 2021-06-08 08:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 586fe2ee3e59917ccc09db9f4bd2863c SHA-1: d55c35f16f6074ce2293be2182ed5ccc503a67c4 SHA-256: b68b7c88e1a3e1e5834fcc5615fe6214ecfd5417b513acd29dce79df0aeb964c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or conduct phishing. The embedded URL `https://smidgel.ru/uplcv?utm_term=bloon+tower+defense+6+hacked+unblocked` indicates a lure related to game hacking, a common tactic for attracting users to malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

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://smidgel.ru/uplcv?utm_term=bloon+tower+defense+6+hacked+unblocked PDF link annotation
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d882efa8---79845110601.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/eb37db2290ec0936e1a766fee2fd9c6b/netosog.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecc6ebb98---84023853126.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6827059f3bb6c186de9eeb5c9a1802ee/fakulokakabapevoke.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d1b9d457d---kenet.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/jamodigazi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20412022b---28540262996.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ae9cade3b1f0a5d18ad6a6818614446f/39902626153.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/64452207353.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507055937556142.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/garenuder.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfd7eaa81---kewefuzubofutuwi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b42b4bca---rerelupos.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vaxebefufafubexalamiviko.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6dr5l168mhovafp0j5gg8eptt7/dotuximevawajojizi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3258905b33---48379919373.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2df480e9---vijirofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 5608 bytes
SHA-256: 200857d3abd29cc436a4b7898a9968b6775ff29eb6cd74d7a7f922aa38cc5c5d
font_01_sfnt_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 10492 bytes
SHA-256: 80da6243d55debf82c7634b7c7bd4724d951dada9582fba89053339544a74d19