Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60e4137c59af8cd…

MALICIOUS

PDF

110.8 KB Created: 2021-04-30 16:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c83621ffc8bda4b69fddb3470437238c SHA-1: 6e307b2a9704036dc4320c8377f137608bbfffe8 SHA-256: b60e4137c59af8cda45519c2b27781804fe4eb6c5df2b14be63fef0cf56e35fa
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and link farm behavior suggest an attempt to direct users to malicious content hosted on these compromised sites.

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/22fa7f65e4f4523a14b87017bd4c7466/nupuwisaxi.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ee05ef35d8b48a3fb04771f34f39003d/78213524654.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4dab1021---41024961191.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/57d28082212f62d2fbafd2afdea4fd7d/48935614887.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/33733383868.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160852824459ad---ruderivasukuto.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ac31c109---nevufojogape.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2q07nh5gfcfh6ghpb7nek3buba/73055640418.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160852861052e7---46658575162.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6dc6157f---jugosasebagatedebip.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082920b3427a---8279395908.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/gqc97nci249epd49mgaj9g4on1/21817853407.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/i8nh4o943m3od63mtu20fp8pts/92358461716.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7a02dcbc---63055513704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=guidelines+for+ecologically+sustainable+management+of+riversPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17316 5676 bytes
SHA-256: 21c8e09f15d2eb1d34536f89730e1b26c9c4aca0490300e998e631ee09642ca1
font_01_sfnt_off0001865f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1865F 11844 bytes
SHA-256: 091ab9ea8b4c07f027135ad421035362ee550878a39b3a2ddfc465d9c6201c1a