Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c725d60180f7533…

MALICIOUS

PDF

98.6 KB Created: 2021-07-23 18:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8d4fed5f1feadbc8f9b4ff946a3e94ce SHA-1: 7fde26fafc61359aa3bd560d29d893e794921861 SHA-256: 5c725d60180f753358a88d6732909454cf7440f8b2a536ab0665d1bd171de1bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or host phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef7b417d0---18713087946.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pdfn82tp983auutrt7lnj31504/22636174645.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beccf29222e---54686362805.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/lorux.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/mokewo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5351c8758---96480925988.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b14feb171b---86794019105.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/3a845fab15c6b468df955411f609b889/xolunokojabirog.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0e7cac140381242b2da49dbb25204990/71776758455.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/14230685870.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/197fb76394049e0e99ed128e0fd1e4e9/58891115936.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5fc77bcc6468286e8dbe9bcb45970450/zajipaseduraxirige.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/wijuwologini.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/80827267458.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4c83c6c5---zubivapuwelukukan.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-6/20210606114233667753.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/sovepi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/72669710013.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49621eec1---84621112916.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/oecdjti8j5qumd8gsrku9um2no/67919327119.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/59859352056.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/v63bra5a0c7pfvcua3356csmf5/dibitaxafadomipixi.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/feramovajetixepumazek.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/94322904088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+prophetic+intercessory+prayerPDF 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_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 20136 bytes
SHA-256: fc0ce4f006b2371eda5005bfeb1fddb2fbee99ba237f0696a3e04c2ccf6f7cb6
font_01_sfnt_off00014c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 10532 bytes
SHA-256: c802fd763378078398f1201a5b0cabb68023f9a83bccb6c97ce2c15c4b57245b
font_02_sfnt_off0001642a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1