Malicious PDF — malware analysis report

Static analysis result for SHA-256 24943a23237e8b4c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 22:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 779edb78279870a69931b609afd7948f SHA-1: d6215a45eeae87ca50a4c1726b88e19ff6729ec2 SHA-256: 24943a23237e8b4c33afa4bb1494a1afce292bd9fa1680375b0d7013ad4fbc32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to websites hosted on compromised CMS platforms, specifically WordPress uploads. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/aadc75f540d54c00f1788070f978b5e6/xilazudubemofalo.pdf In PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30077190705.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/77159027103.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/32269333769.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/52263966568.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/39212564349.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/85994166810.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/061172cc9a257ea4b449b3d0cbf6b13d/zurosigedaxokeb.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb05300cf6e---50190016942.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/34264815059.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/45706118896.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/22207822251.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/56274420884.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7983b1bc2a2cb63775c83b58652f6c4c/xefinipi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xezanuzoli.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/17855871101.pdfIn PDF document text
    • https://hirurgija.me//files/netulinasuxusi.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/72915287590.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/34240328790.pdfIn PDF document text
    • https://landbar.com/upload/files/zinazugalitimurilavedade.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202165233105707.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/528c8244c06e48e18cb8d12abb95a71e/63933856.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/744909240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=slate+digital+vms+one+preamp+manualPDF 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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 17952 bytes
SHA-256: af6fa5bf10b47d1a7ebf22f0f87faa956effcb85af0f62b410329ca659650077
font_02_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 10976 bytes
SHA-256: 255e95b67fd29620f3acd0bdbbbe73ccaaa4d16ea3c51e6bd39c1607e5f1b795

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