Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9b6305bfeb9e1a…

MALICIOUS

PDF

94.7 KB Created: 2021-08-07 17:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4b6ac1143658ca797e4117ad78e3bf0 SHA-1: 0579d51331fdf5c907b526c2912cb2a273504a5c SHA-256: 1c9b6305bfeb9e1aa509568695afb7644919560cf332516bb62012280ecbabd7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is intended to trick users into downloading a password-protected archive, likely to conceal a malicious payload from gateway scanning. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://odpadykj.cz/UserFiles/File/44394972049.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca202d7589---284901882.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/92kn9sim0m9fkl1p5mcub4mg73/zisim.pdf
    • http://csc0311.com/userfiles/file/20210617165332_3zoe3x.pdf
    • http://www.sport-konyv.hu/userfiles/file/83640164189.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/xukevifapu.pdf
    • http://www.ecvbrass.ch/user/web/file/wuzizax.pdf
    • http://centronegozi.com/public/xufokupej.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac0822c1f---51418887586.pdf
    • http://gramercy-grand.ru/files/file/92128134678.pdf
    • http://unityproductions.com/upload/files/10146531853.pdf
    • http://dchs1961.com/clients/871949/File/sorapemamefinub.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060802521980554.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e80828be1ac---54114780295.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07c95d6ad---tidunezi.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160aab385b2af0---xidufugur.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c5f4da58b576ec86cc6180ad3413104b/lemanivijipulutep.pdf
    • http://ozhelalikram.de/resimler/files/97065697999.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/jq7mn69ddgedpjrrrap40svvul/51487208454.pdf
    • http://jullien38.com/ressource/site-image/files/64182342034.pdf
    • http://allaboutdowney.com/userimages/sowusitawometukuwukigamig.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6522a90087---xukelulonupisunu.pdf
    • https://alteanetworks.fr/img/file/siwefepomikekovevurane.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e81c593040d222422369602ec17251f6/xafuvuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=descargar+mazinger+z+pelicula+completa+en+espa%C3%B1ol+latino
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 16792 bytes
font_01_sfnt_off0000ff7f.bin
7235cae79dbeebbd3d49a721bfa5f752ebf7e530c9e5881750282951f827e9fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 18336 bytes
font_02_sfnt_off00012e02.bin
59b95fa786d15e4cb132a9f38ef06948c06682db130b4184c79729fe62d18999
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 4096 bytes
font_03_sfnt_off00013d7d.bin
583775b412ef5c49e1e3d1d46ae6fffe4f2c7bf2c5385fe3dbdc3cc68f632db0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7D 16268 bytes
font_04_sfnt_off00015367.bin
6db931b4108efeaccfa6d54e24fa18e1a7d0a9fe8d488d8d0e459664ee694ae1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15367 11084 bytes