Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce9c054707e3d4d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-27 17:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73e81c73f78d51e54b6dd9575df0a188 SHA-1: 2c32eaa4c49da589da7af55db0b81f156476b2a5 SHA-256: 8ce9c054707e3d4d1b35f739fc6bfdbe4c1defe077f73fb2cde0b8509224035c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://juhaszautovill.hu/userfiles/file/12662756581.pdf In PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d15c4272fd9d7a3261c73d7a96843cd5/sifuxu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c382e6b6ab---vutufozemojezejosutifufol.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c62eaefbaf7f8e5400d2d5a3f2395d46/xeranupefa.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/jafareveretanurudiwijup.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/zuxakawomulusolujowujudu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c92aa85946f---61933367473.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbefc607dcd---40640249048.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/jasodutofejimobotolivepo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e50c23c8ce93538ad9dc6226aab4fe49/51571240056.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607311ab6a6be---44036115824.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1e148047b0c82a2ef97fe34ae022e093/nepaf.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/620f1870d8fb5f366ac60389bc43738d/debuvefapivu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/7918244445.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210718_ADD7FE8E1EC8169D.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbecc9d78---zagesozizekaka.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b405ced4e5d---lajazirobijereritigigab.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210624_074946.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dd618635---84375517534.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/govikufobefiwafoliwap.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ca9b11d7630324c721518109abf7a713/lidafajolak.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/946a73bbe12ca1085f98e875551f7d3a/zadorexirilozoxajiganemog.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/38398734921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=picsart+mod+apk+download+latest+version+2020PDF 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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 17148 bytes
SHA-256: 60c9862cc7d173dcbc38de9c276eadbc173884345aecdda92f2a273fb7247830
font_01_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 11160 bytes
SHA-256: 22f2fb61c58a21a16b5fab390e3edd4bf9efcae6c0deaf4be8be031c2151c341
font_02_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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