Malicious PDF — malware analysis report

Static analysis result for SHA-256 9372717b0162aded…

MALICIOUS

PDF

90.4 KB Created: 2021-06-25 20:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4426ba84853df553f9030fcc8021657a SHA-1: 00e13a7c99822d8547cdf673e2f99dd3352c6b48 SHA-256: 9372717b0162aded215849dc7853aaf96e74da498c821f4fec2e763974edc1aa
156 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 numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://infrive.ru/uplcv?utm_term=class+9+moments+the+happy+prince+question+answer PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684a2421b4---buzotafefisisokudezi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f5952ae5---mabakito.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lgbsr3qfnnr71nc23soh6rpd32/70964336911.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5m5nv0leb2gcu7rn2sr84itvg6/dajofobadimonodegigotod.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608100cd53703---botinevonefumonaviziz.pdfIn PDF document text
    • https://rinducm1.com/contents//files/76358106942.pdfIn PDF document text
    • http://minipit.com/data/files/14321428567.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba78a33064d---sametilob.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/49u34fp5443apcb0jhfm12dl67/padegogexali.pdfIn PDF document text
    • https://inncredel.com/uploads/gujesutijapurorexegurol.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/muveledulepirafozeg.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb388f76d---magejebewimiletivujapita.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869763de845---14738222559.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/85e721371ec300dc25262ee0403f2a35/wulede.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/tevetikodoxafob.pdfIn PDF document text
    • http://whatdwellswithin.com/file/68274807496.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160730b7ebef8a---86240331060.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608573bb36f76---34513445795.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4a5f015a5075c9a10e47009a0a765ec6/42672495388.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8e23de9a7504875838d1ea0f27e45035/10054163727.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xinoxajawurux.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b75ec476cf027e006e40fd428789b343/wenaf.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f9551e99---96063957965.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2c7cbdaf0a426f8aae1cf820de391b9b/18858344096.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160766b3ce04f6---marabesu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/64031885420.pdfIn PDF document text
    • 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_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 11284 bytes
SHA-256: 6e0e3cb9b00162180339bd824c447c78e7b8f5382f39bd802c64619538b0e4d2
font_01_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 16572 bytes
SHA-256: 8b5649d0a27b9b59431a06904468f7117a25afe23616ee17c5a739097165b3d9
font_02_sfnt_off000141ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1