Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cdbb09153e0d20…

MALICIOUS

PDF

87.1 KB Created: 2021-07-19 14:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88b54dd5933eed7e234d8a15cae6c090 SHA-1: 024ddd551da40190581e56c90588f3109cc0d08f SHA-256: 92cdbb09153e0d206efbca2de06d7beb307d01256a0fdfa9a5f84ae18c4284cc
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of a visual download button lure and the compromised URLs suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/dca98d2c158119707ec0ff5e4a60464c/74552214851.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/910a258df3afc354a60a3511c74c6e5a/zukesojodibebufigatala.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5016bdcc3addee1405b24a221ffb1f33/zugovebanivejo.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcc554211---momuxuxojipunuxebow.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa129c1e25d8604b84238cc41526c44e/91138807370.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/aht25o51f041952dat793i0hi5/kogijelo.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a241fc23721---weforagexepuj.pdf
    • http://luberoff.com/userfiles/file/90683803905.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c113c3ce---58744191722.pdf
    • http://ajtoablakcentrum.com/_user/file/tobasewumelefovotidige.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bec72e12501---54988253963.pdf
    • http://homeshopeez.com/uploaded_files/userfiles/files/78629034002.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3080e09f3---wopizij.pdf
    • http://laiyi-art.com/userfiles/file/83922838507.pdf
    • https://isleo.com/i_photos/file/1389760984.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/44691840956.pdf
    • http://studiorapizza.it/userfiles/files/posidupimesigijo.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b7f1126357ff933877b768594aacb79a/sokamodomolegibuwasilojag.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/pulojajawok.pdf
    • https://adepotcustom.com/UploadFiles/file/20210505142841104.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c136b4ac1f---zitepax.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69156e8a32---tedawemekozotad.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be54a754d8d---debekuluzelevufitok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+anchor+baby+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d3.bin
e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 16920 bytes
font_01_sfnt_off00011ddc.bin
bfd3ad9b77f2417fde803ec716ea0ae2382341bb72f05bb746f90bd26030ee01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 10984 bytes
font_02_sfnt_off0001372d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 16792 bytes