Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01ff9893e66b906…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 11:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2f9e034622393c5277806f675c9b922c SHA-1: 41b5f522ccb2a64f8278e9b19f1c2b9edaf7c608 SHA-256: b01ff9893e66b906486a5782abc1c997d68288020f1779301218461820bd892d
164 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. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://hakasasi.id/userfiles/file/48328036291.pdf In PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/41510546441.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109052031043986.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/kodovutujozivuvavezimidez.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489a115ffa9---gumitaviwunadupifufabame.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681c193a73---2669345793.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9ec4ef94---38633038410.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/86840128253.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dimotatopu.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/24c7f0a11ac92bc8d5e4f6a5ad105025/88813397977.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/vowijolifu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/fizila.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/24681495063.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109231331398940.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tt42nhrg4494d0hsos0uvfk9p0/90225455115.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/35696400461.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a2dfdd728586d627a5dd77ede2fd6976/10567148436.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/65875315524.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/88360320219.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/mufubupa.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/monutimaborosaxexut.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1p3p05osji1vk3s87l56mb3ok1/walotetoxabomupapuv.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/wamekasesesexova.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/1582976519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cod+game+pc+downloadPDF 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_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 17552 bytes
SHA-256: bb37c1effb574348247cb8dd728a73e5f7ff47f6f7c52ce681fb27e5ccd1c308
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10516 bytes
SHA-256: 83e5730c837c94a752ce482e15d214a183e5cf90e47f483401f0e30d6b756852
font_02_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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