Malicious PDF — malware analysis report

Static analysis result for SHA-256 649c59e75b1bc712…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 05:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e4fde0e1e1e6622719c03e9fc9d0505e SHA-1: 31fc93e90988a551c1b8294e8d3f7d97a3c53e80 SHA-256: 649c59e75b1bc7122180cad296f83a4b7da465b5b3537b0c4f4740c2bd7a451c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious domains. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=fraught+with+tension PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/96818ad38682d95e871fef7d14832602/78383410260.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/145df653dd989bf1c7f92ba8c0d0902d/ferososurezasosivof.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede8b8b22a---34522899380.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/4738418368.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa9603c05---zubitolafitezujaze.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/pomupef.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607031c6ba953---suzuxofaf.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xerakurovoko.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8c2c3dd4---tuzejuv.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/vipulekowojewij.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a1jt4h939uqtgskmr57hv52c55/17070960062.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/626299f606a906db3c7243b6ed378414/xumanimekejolajab.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/aecf36cabb123750ce55b6bb9000a34b/leraxonijos.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b997ef7b2a5---18975185986.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c7365eee52105a10bb3981ab2d96dc50/fupetarixox.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f46e8296bd8dcb9185cf43461f82ac1c/puriranupajilositizesur.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0d2d4091---3652986299.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/46566458969.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/24273983573.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/22772217984.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/dudewilek.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/32fb6dfe0dac88709d2f8006a5f42c68/dikodozalela.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/47730239744.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 20436 bytes
SHA-256: 26dcddc8a1805ae2bad78e41f43fb1b5f37f3b483f8b3b4427d99971105c6218
font_02_sfnt_off00014196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14196 10504 bytes
SHA-256: 74ba9f53c8c87c056d42e2e1d2235939f603c1196a8e427a8e3c483349960111

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