Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f3bf30c405dcdc…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 16:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f7086d0efc09cd6669c9237b9aee645 SHA-1: ff5b6b69e0ff8c120e3f07f8f010bb174335690d SHA-256: b8f3bf30c405dcdcc4200f312c4a0af6bd488337cce6fa158b2aabbd262db2c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pepajadasesufiluvebula.pdf In PDF document text
    • http://www.chatanakonci.cz/userfiles/file/86491430459.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/41e9337b2edda6367b809e5a9c5c9c0d/rojarabajufodokip.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085c9a098bb---wuxupabusam.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30e318e62---tufesetebunixuvowamamuz.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/95981029380.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4sl2u0q5fuaftcl4i7fsq2d8c3/subuvoxunezibexurogejup.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/3781817211.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/63437895826.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/daa00baab1182311a22fd094662a19be/45855475946.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec3270416---zamina.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/busozatebobagobute.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/pipegifagawanakemulufap.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hlu749gr8iknhano2d0bq7fu5s/98530066756.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/os3i0rio0cht8c53caadhegb51/zevigesenakurufisamor.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/96203daa8aef1592f655442a2a73ec47/totopokowupir.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1qoola9q7ifi2l8kdgerqq8ha4/xabupomoloxiseteto.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/abf0e82232df1b57641a614fc3ba2fa1/govogirivevagakixolu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffcf8622a2---32292651825.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/60543854185.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/cris7s9025p3kar56m4lcsegq1/potatixuxififak.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/hvliinparb1hkmb57fmgnra6g5/zabevojirujenezibakod.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a076107f2c8---20533048974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=in+search+of+respect+philippe+bourgois+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_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 16740 bytes
SHA-256: 2cebf1c024074a75f8cb02582d26ca92f9782524da994f5de3269e3a9e7baae4
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 11092 bytes
SHA-256: 9b5d417274b47dbc472e369fc335f79c65915000cefac8e8b19802388c8e9556
font_02_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1