Malicious PDF — malware analysis report

Static analysis result for SHA-256 401097cfa9456561…

MALICIOUS

PDF

86.0 KB Created: 2021-08-14 09:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ebcd272d64a629eae8fca49159193e2 SHA-1: d2c3b17db4085cee5ab2133ea138f9a2f03a1b24 SHA-256: 401097cfa9456561047620b0e14f0431df1764baf48f6548734cc26bc9f65702
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/q5o9osafnoifirqqecim37mh27/3052067742.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/34e7263ec7729eae282f89359d3d9f68/nemukojatokosumipivexew.pdf
    • https://tagoproperties.com/ckfinder/userfiles/files/14156068496.pdf
    • http://aaykpn.com/uploads/editor/files/19067460081.pdf
    • https://habibitours.org/ckfinder/userfiles/files/vutabaxusopugujakusubipi.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7af346158---70040799904.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16102baed90b04---foxogazobejazanaporero.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e9ddbdaa---15928631737.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/10038ffd2b20839aeb0e6d3bc17dfcd9/vivawibababagis.pdf
    • http://vladjurnalist.ru/archive/file/74327263063.pdf
    • http://goldnumber.info/userfiles/file/46757201676.pdf
    • http://www.kickcommerce.com/userfiles/file/68222785397.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ebcf87ec519663d9cab5e81e4995123c/44348706054.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vbl9hb9r8aafnhsf55stei5dhu/simozud.pdf
    • http://nceed.kr/pds/userfiles/files/22614279955.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6bea8b254---49473590845.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/562ecad105e893446bbbd4f9d94b197a/watovefazoki.pdf
    • https://calendarsunrooms.com/userfiles/files/mowajorevigogi.pdf
    • http://ruresept.ru/files/file/fufufabumisusarimogube.pdf
    • http://bannermaul.com/userData/board/file/fegarekegek.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161031c8b7dea8---52790893416.pdf
    • https://marblobaths.ph/app/webroot/img/files/11859792536.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/55823857797.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=elements+of+programming+interviews+in+python+pdf+free+download
    • 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_off0000ec13.bin
fa24731612d133247717afee3b17f425ce0b802667e9e7fd9af8a03a54f376db
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 18228 bytes
font_01_sfnt_off00011cca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16792 bytes
font_02_sfnt_off000134e1.bin
ae868dd5047f72c1a718f3f28e48b3463a3824bd0ea2e68805f8b26d6f6f9fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 11192 bytes