Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc22b06bc7b9206c…

MALICIOUS

PDF

85.4 KB Created: 2021-07-27 05:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b554d806c30655443a862fd8e0b0628 SHA-1: 531655ac01812859e54e6b6fbe62168858caf988 SHA-256: bc22b06bc7b9206cbba38415e862f6f8a962667feb7548d00f40829156ddfcea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to external content. Embedded JavaScript is also present, which could be used to further exploit the user or redirect them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://aihyang.com/userfiles/file/viduxugodutosixij.pdf In PDF document text
    • http://hotararicedo.ro/files/files/tojaxe.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/32f0fda9de32ff4b136e6dd7e1b3f958/litupip.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/76819951125.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/71119897a304c39a19fa86ca0fefde8e/zosalavorajoluvakales.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe2d2c957---53958049279.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/wuxajemigape.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/66194549039.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/60805543322.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d590f4c6---kabenem.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bawejofuzuza.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/346413816e6c5bec4864f6e5f53246b6/daferib.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf44141d5e7---60394378626.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bmj0rb8dpkeu0si03hu8u34ri1/lopogoponivuliloxozujasof.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e603c2c911---39012807638.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/bixalojuvixujanipibekigu.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7e6a0461---zomuxoseruja.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/af12de726e43420b7a7482f148e6fc9f/81826476854.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/23897112110.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/rozikiz.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/7377620777.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/tivupevutuvafir.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/pimufebusokofobezo.pdfIn PDF document text
    • http://kmsenior.org/file/files/ziripabemi.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///givopixepove.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gurivegariwipazo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b614949bbd6---36482498320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=free+download+video+background+mp4PDF 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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 11128 bytes
SHA-256: 4cb9e6bccee63e0b91c4f0e4fe6e4435b61be76cad93a52874dab4f59e0032bf
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16888 bytes
SHA-256: 0535ecb2b54b80d0ca0006b47b685661e29c45409246b539b64119091497395f
font_02_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1