Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b7a998145453b8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-03 11:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cfdc45bdc1b86df0a33e81a36504fc4 SHA-1: 0a7d83f228ddb5189d67d8aa096cf5004b9cd125 SHA-256: a5b7a998145453b88f54a4a647ab732154e814e9f3bf3d19d82366aa9e830116
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to manipulate search engine results or host malicious content. ClamAV and the ML classifier strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the presence of multiple compromised upload links suggests an attempt to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ee284b7c95a---23922986209.pdf In PDF document text
    • http://gdbchurch.com/clients/43262/File/15377553791.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kunadalope.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a4eioieadee1g3gk7nesoaths8/69790654598.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5c5d5fe8847d616b19fb83347665632a/xolisizemewukegol.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/52605820847.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e23fd88848bec57767dee7d3b384b000/89850743143.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/75368319680.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611728407b45b---23770755734.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4ebb6b7f---85711027506.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba11fc7a39---lubisumofo.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/29471250208.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zovozep.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/fipotojafolejobej.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cj4r4hjlbpnevo5lpi12fagul0/40891314461.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/85212798620.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bdc165d9c028721c3686b3eaf462989d/dedude.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/tunivawozorefokogura.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a659e6d7---jomopobigufipizezed.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/82711251834.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a67aebd4ff3d41ce549cfba4fa175756/7156969145.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b222d05d6---wiwotiluvizumekilogu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/27449679958.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/18740758244.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0767956ba---44947438009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=circuito+productivo+de+la+soja+en+argentina+pdfPDF 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_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 18392 bytes
SHA-256: e8216e27a53a34a34f48799f51b0aabbf3dbffca507acf16b3a65ef4f8484920
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 11124 bytes
SHA-256: cadb9ba7215733ab385b67089aa058a7579e3147ff3adcdf956d316f2cbbbe05
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.