Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe53683f34f12a2…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 02:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c3f766d41a96e1f739b10664e0d1b99 SHA-1: 5a3e56a1b2c1f14aef711f25903fa4689070e1d3 SHA-256: abe53683f34f12a234bd11748b8dfebcba0274bc82ec80b0f746d56ecc5c74f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised websites hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable or compromised hosting for link distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fotobolfestmeny.hu/mvc/userfiles/file/ririxajiduruxulanubozos.pdf In PDF document text
    • http://confidenzacsapagy.hu/upload/57018494536.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/88706058167.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/pobof.pdfIn PDF document text
    • http://termocity.by/pics/files/funedoxiwetuni.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/46719615868.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/91037968537.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613920c6ec3e9---garabuwilulokofof.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/28872030880.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/96111814905.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/gapov.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61cd2c367---34616366725.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lobevarunelufisewufiputo.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tufem.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b653cb280---62969849104.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/44977998694.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/60130316422.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/18762268104.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dc1f4bd0979682657df2a95b9da2fa4e/33288198468.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/kiwuzumojirifa.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/60386761159.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/49757555304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=chromecast+download+macPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45E 10660 bytes
SHA-256: 44c2bb3cb57ab83c3f1f4f161218f3150b54c8827f0dcdee68095009f24a43b2
font_01_sfnt_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 15316 bytes
SHA-256: 65a120a5184a0389e4c8517368a9f6fae86266c7e18fd8213e5fe2b49ba1b4f1
font_02_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1