Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ac5124927c7482…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 16:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 080c7e27d2e848fd80a9282b44bfd087 SHA-1: 8197c664acb8c6bb5c58896cfee323d1a18d0690 SHA-256: 98ac5124927c74820b5a77f674354151f516f50a1008589a2bbe1e4b54c58707
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document acts as a link farm, directing users to multiple external URLs hosted on compromised websites, increasing the likelihood of phishing or malware delivery. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dansensvenner.dk/imagesfile///23011854605.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/o6p4rphla3fcdr89umjivgo1q5/lijekaxu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160982b393309c---jororitojetelogi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b626b25b7c1ecaa9f3b44bab24969cd/4133527958.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/10781956245.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e8b612d0bbd7b4c0e3f7ec9abe6ddfca/fedot.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/43697636248.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/98788496650.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f27dac14e---76569692067.pdfIn PDF document text
    • http://tuzlakart.com/files/12710478562.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/ruxetor.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/9669828541.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/40205933641.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/18302689192.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/91038335286.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/xamururuvulunumalifato.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ilhekgrg27os3t5mqiraan4lsk/68266765451.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/4122364786.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202179197195584.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/jejunejunemusolomoguxal.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/28961217956.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c964f152af4---fomomefufefak.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/lemaloginuj.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/85318024502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=toyota+prius+prime+2020+owner%27s+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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 17676 bytes
SHA-256: 74c1bdc36d825d7242fe7f305b2a45263ae5a9bcd88bb6040ddddad16f622d59
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 10952 bytes
SHA-256: edf7de4a741534f3796207b3004fbd79251be77528af9cfa8d9357b541256782
font_02_sfnt_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1