Malicious PDF — malware analysis report

Static analysis result for SHA-256 b303966964e60e89…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 09:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eaa1bd07461bce8dcf86ce5e55b93b95 SHA-1: 1714b516a37f0daeccb9a1159314a4ea7987d087 SHA-256: b303966964e60e890f96b5b3f41b96af03b99145c565002f5a51a47f5a017cd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The primary goal seems to be directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sunnysolutions.it/uploads/assets/file/82113645612.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa4b95bef34c47c4345620fa418ff1aa/gosolepojirupa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cc7e4444---98221126281.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/10932492048.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/boponesagizosanobodanavo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af714804f07---lerof.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/vexomeketumo.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/vepevemopipojenoramon.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/pabulitixa.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7f708bc6ce41cef039df7fbf3083138f/61192626642.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/wevin.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wawejegexidos.pdfIn PDF document text
    • http://iviltra.lt/images/files/23852833900.pdfIn PDF document text
    • https://priscar.com/documents/files/reduxasero.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/73401032915.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/75307498813.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625396525.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6e99c763---45358611270.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/42928074990.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/61175015541.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/acbd2eaff7d1248eeb74a3bf33702efa/kupomosarumupozabi.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/28470073123.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/83480535031.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9de9fc19---penivuzatib.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1622609417653749243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stream+of+consciousness+to+the+lighthouse+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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 11244 bytes
SHA-256: d4664efa292c32588a2573a398e6b40e5027c2695e774c30f213e0ff3354542e
font_01_sfnt_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 18132 bytes
SHA-256: 2bd741261f395ffb9f512a58d54a621749fee8d58e44b83f2c71c66a79cd2d70