Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e6a2918f60a5fb…

MALICIOUS

PDF

88.4 KB Created: 2021-06-28 04:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c528b5366d119ec9b6766cc0b8b8cec2 SHA-1: 92124900b601d3916ee7763d20d9b660eabd1a05 SHA-256: f2e6a2918f60a5fbb9d951ed8c62ab046c16ab9d1e9fcd26bd0f8a3e874fb924
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0l2v9dimv2rokf7ghplna66mu2/vurut.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/e55vmqt9t9o6rkj6l9kn7ktrq4/89385831985.pdfIn PDF document text
    • http://mousike.it/img_ins/files/61862114645.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/buliverifaxoxefo.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/1t2u7fv9lhrh2cjvkbks8rp74f/78465942218.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/10037789248.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/13964515641.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/delupedogokutobak.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/23409555073.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f53c205c9de672d9b8eacf0651b97731/99652536317.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6e4f81251b60e391e9a4864239346117/xavosufujovodotutexare.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70e1f578dc---pavibikalafanogizot.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/kezidawobukidideba.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7913e6d0cd---96526157662.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/wadozixigap.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/35069228354.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc4266276---2693595041.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/36371458661.pdfIn PDF document text
    • https://codecs.ro/images/file/goxiwobutaputud.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216231017344903.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ftcbfph1d5u811ajpi7285hqn3/bokuwotedetipajuko.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7fe885e9---runazigesotug.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa0a98b104---retotipajadug.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096583bac955---rexaxurorasepupovemekiza.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/34mro7tt5astkomb239go8rkv3/51945544206.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/evu9nsr14a2f9i0oqhopqhnq1i/39441631401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mother%27s+day+meal+deals+supermarketsPDF 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_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 17776 bytes
SHA-256: 55225439a76261888329b9123c4956a5aae618873cf0bbbe9711a73fb44e4015
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 10796 bytes
SHA-256: b27135cb62fd3c8f22d30a82b28097a65d0799abc1f0bbefab208343381804bb