Malicious PDF — malware analysis report

Static analysis result for SHA-256 582fb347600486f9…

MALICIOUS

PDF

87.2 KB Created: 2021-06-17 13:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 750c8592a462a1aed48d29e06821d942 SHA-1: dd67268b2434f1a33f074c6d0d35acd701f3b18d SHA-256: 582fb347600486f9ec12645255adc56c7b62dfc50c592f3283afcfe434e793bb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

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://crysiq.ru/uplcv?utm_term=drift+hunters+unblocked+games+76
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/aa655412fa7e6f949dec361832cae31a/43677407686.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/rmrsjiek8i5fnb6fmfkh5pke94/lamofojawu.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607652fde8fbf---nabiwolozudasilidejenu.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbd074e9f---kepow.pdf
    • http://maynenkhiinverter.com/media/ftp/file/fimiwarudow.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/9dfeae8932a932c77d310da783ecb6e9/midapuvufidofupevefe.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f082a0ba30---lozovezupuwepapowade.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/03a0f5a6f50436a9452efcf4ad11501e/95913780948.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3i17af5l2k5gpsmv8frhi7ecaa/fadoka.pdf
    • https://2acontractor.it/images/file/88908388785.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0da8410c95---fudabisudibosijem.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e36322c0a3---9024405962.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rni40vtjv7naae66aljubin2g2/sisuwa.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455efdd710---79943812898.pdf
    • http://lovesushiscv.com/uploads/files/kitisofaxowa.pdf
    • http://www.darvidproperty.com/news/file/kivezerufonu.pdf
    • https://advance-pack.com/editor_upload/file/vesosugul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001070b.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 6744 bytes
font_01_sfnt_off000117f3.bin
1c5609f121a713838336a18dbfefea14ee12ee9ec9898c9c91efe1cfe44de9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 5872 bytes
font_02_sfnt_off00012bd6.bin
8bffd275bb9f23914a3742fca53567844b234064dfabe794e709fef891f7f0da
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10416 bytes