Malicious PDF — malware analysis report

Static analysis result for SHA-256 2903e8bcb8e6d8e6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 17:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d68fb035bec1da96cfdb5bcb24bd0259 SHA-1: 9b763cd3b2c06a72eb77f98f3e0804b168250c23 SHA-256: 2903e8bcb8e6d8e6fbaa8165a712f47e512bbb56d59e2d1eedb69e6702f30a34
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security and deliver a secondary payload. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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 https://crewmak.ru/uplcv?utm_term=remove+online+pdf+password PDF link annotation
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/vesuvinumub.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/ruxavopapijudozewus.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/xajuvedikob.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/84183502060.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/6759880326.pdfIn PDF document text
    • http://deauville.ru/files/file/93999583685.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/gawisamazofovajaxox.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/26736633120.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec71354fbf---33022024949.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093f1cffa1---77771733292.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/162311266791.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/rikekonufazudib.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/79716309957.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210917144916_1061329764.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/12366761720.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kazuvapukadaxuj.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/12723512350.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/48715970227.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/89963412544.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/17173078085.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3768dbab---92013412129.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/20466161282.pdfIn PDF document text
    • 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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 17760 bytes
SHA-256: 767d303cf8fe8389bd69b61491518d0c6919808e702bb882d7b371e1e9a042dd
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10756 bytes
SHA-256: 2005611296b8ad9dc309c5f76037b300f40e85ec83c52357357a471038ff3426

Open this report in the interactive analyzer, or submit your own file for analysis.