Malicious PDF — malware analysis report

Static analysis result for SHA-256 017bd56438bcc754…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 04:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3438f9920b407b239658c50124338d73 SHA-1: 73f33a1f7d3418ecedc34833d1d38f848fc45f0a SHA-256: 017bd56438bcc75430b700cf029cd958f4506f8e54f1b97ac23c3b6774468d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links to other PDF files on compromised WordPress sites and disposable hosting. These links likely serve as a distribution mechanism for further malicious content or phishing attempts. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607febad3645f---42376769130.pdf In PDF document text
    • http://marketypik.pl/zdjecia/fck/file/roxalewopifuzofu.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/90990773378.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/76894410463.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/zeladizasux.pdfIn PDF document text
    • http://ubest.ru/images/file/27632305853.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/pomibaziwewa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/425sn4cnhr3qq0vqkf0sh4scg1/kijuzuwudujinezugokuvul.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adff38804cb---27601409027.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/bitefoz.pdfIn PDF document text
    • https://zzwgjx.com/d/files/96578902826.pdfIn PDF document text
    • http://salkim.com/userfiles/file/45688982612.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/99494865055.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/oecfistdvf3o0ddfu9ru89cqd9/79896813098.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/20338361865.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lewajalufebezaturu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829b06de0fd---gagixotexavibapakusa.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/paferuvivejomi.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/kovamemixujiziwotijofib.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bad68dbcd68---fizesemepiwo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10a074102---77507034045.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kubodud.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23f108f8e2---xavijozagudupalilujo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160800beacf5d3---14253060953.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cacebe52c4b8ce60df36d930cc3fd3d2/sufulawapolukubivugix.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vshtf6f96attlh96drdgal3imv/fotomerorirexubapes.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb3ab0743---dunedug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=a+taxi+driver+full+movie+watch+onlinePDF 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_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 10908 bytes
SHA-256: 7d7bded1551d648deef6348d26208ed6f0c85dc5d4baa22b7797063f7d5bdc12
font_02_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 16960 bytes
SHA-256: fb62dca26ed52f95beb05eae8de57d8d8b5e8d688d00e8bd804621862dcea9cf