Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acc8df21fe27d2d…

MALICIOUS

PDF

79.9 KB Created: 2021-06-11 03:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3787e46793644bbefc3326fa58bc4ff0 SHA-1: ac7cb9a2fae5ec53faf3ac20c911b95fbae7f205 SHA-256: 6acc8df21fe27d2dc038ffaf5a2e9b4aa01b4e6cfb988cb25487cb212f424d87
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to distribute malware or facilitate phishing. The heuristic firings indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to trick users into downloading malicious content, possibly an application like 'galaxy shooter apk mod' as hinted in one URL.

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://krisoc.ru/uplcv?utm_term=galaxy+shooter+apk+mod PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c6a0caf8---82642976437.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/390d066d7b83d6fad1bac811ea4e78cd/97233655174.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/63012818490.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/46397266288.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/620d03cf92ea77b87f8514c37c4fb970/74169285903.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/32121932398.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/777819407.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f4666d02d164f55da8863fb549af1eb4/piwop.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde16adf38---gikexotilopo.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3128c5bca74ee1b4aaa834ef14bd5ca1/89914102429.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8962173a---duwotonebovokukovaviwo.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/8171493568.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/relazimotixojusobatexijiw.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/07e9a33fb08057e37e9e467f467f277b/20943121532.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/687b969b8d34693fe8bbeb06f63b2277/pejepovakewofemojew.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608111a4de94a---32605436171.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/fupufea0n4ng1i6fbd2po27vpc/18468845386.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/pikiladivufixaxula.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d3fa27a4d---4313644781.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ff0259e5---tokasiz.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_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 5464 bytes
SHA-256: d3e616934d6c6c4247c553153d6396ddd41541a4c7abb3da8f640e1fcea9a39f
font_01_sfnt_off00010e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E95 10420 bytes
SHA-256: 1794812027a51e574ce89de01b80958f528be7ee06239c07a2f2063e2e8ec3af

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