Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb20c28de1f8e13a…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 08:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58a27d331704745d7465cbc20a3fd643 SHA-1: d1eb6260ac5469c8bb3ccee85ca834cb64097fee SHA-256: bb20c28de1f8e13a39a8543e580caf6a63add7c1fc35682df13bf559b32f75fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6df84bba---76865494832.pdf
    • http://acpiindia.com/userfiles/file/50581869401.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da7d9ea949b---suvefi.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccbbcb082---nobazanozoduputo.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/188aded1fdc905c4ab2e62998cd09c4c/lojowozimev.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc2766ddb.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/af4795f23c12b8d14f09ef991c93867b/gidovenikepimo.pdf
    • http://ajtoablakcentrum.com/_user/file/50116137975.pdf
    • http://minhvuongthuphap.com/upload/ck/files/jubojabas.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/55062646994.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/95061293144.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3eef95fb5020ebeba4b716b8796cb1b7/1030190986.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/369bd51d3be1e9ea58ed71c6ef9c232a/jadabogi.pdf
    • http://berbun.com/user_img/file/soledova.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6a528e4f---52070335017.pdf
    • http://clinicaveterinariamontecchia.com/userfiles/files/lizutigol.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/jekofapexetinitopegeratu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7ab1dd783---fivekaradotibaroxubuxevi.pdf
    • http://www.netcorp.hu/data/editorfile/24857334412.pdf
    • http://shukokai-voves.fr/userfiles/file/83358255786.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609081e654f48---zugokumabojijome.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afb9a8c65---8808077978.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ba0154358a11eb1e4e902741edb6cefb/petasetovuleluvoguludo.pdf
    • http://digifast.cz/userfiles/56044715400.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4ea0a6c7076e18e57e621e09cc564f26/45438519271.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dethatching+lawn+in+fall
    • 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_off0000da8d.bin
07d69c6872d04982e56ff54a5cbbbb94df897660eda763022f26ab505df6c021
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 17748 bytes
font_01_sfnt_off00010879.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16792 bytes
font_02_sfnt_off00012090.bin
1b0d0ce8c37495a020fc2584672bf389b13a3bb61a5e99ab0c8df0856acd7114
pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10316 bytes