Malicious PDF — malware analysis report

Static analysis result for SHA-256 0148a8143d837360…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 01:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2d1ae8220811f2935f317c23f5d238d8 SHA-1: 34e6f2de01b57baa3805cbce65a927d45b6fca81 SHA-256: 0148a8143d837360feb314cd84fa31fdd8934e5e221487abe423d581f321e269
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The primary attack pattern involves luring users to these sites, which likely serve as phishing pages or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bluetact.com/ckfinder/userfiles/files/19193542478.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4031f2228baf05a6fc3b14e7979662c1/65947463147.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a8cdd63b368fbfbd3b970bf97720e374/29103195245.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/dinebul.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/9823629388.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4fbd2e21---3140963136.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/mrdskidd8miirl20hf0r0bt5dj/91440598859.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b83e55cc---62908591864.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/57561217276.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b234d568ab6---33196251975.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/17976760238.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fde67a3b---40579988086.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wenarovebuzeto.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/1603514659.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/gerowagulivomejipu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4992d3ea2bd9852860bd68af2a8a020a/13809609098.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/75b8fc8ebd3d552d94bb54cf342d223e/tijaxupuvufifuzikazureba.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/71546112951.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160869dcc6d62c---89487320713.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/j18eflbq2hjc2ph1e73f0jo8d4/8299285808.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160839568788c4---xenixavenikipamu.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/besuxojawukozuxunumige.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sitazomofara.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0811614189---mudoxo.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad682c71c8c---67495934533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=average+total+cost+is+equal+toPDF 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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10596 bytes
SHA-256: d4fd0a43c1313a612f675ee74fcb827a11d85a62bdd1700fe21c73ea983e8807
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 17340 bytes
SHA-256: 0e8c538738c66415ba2c9e0b29de5ffa0a1f7a136a710b9ba95e9096c46b7fdc
font_02_sfnt_off00013330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1