Malicious PDF — malware analysis report

Static analysis result for SHA-256 8293170e1f8b3489…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 15:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c123774cb6127a445b1ddfcbd268557c SHA-1: ce739393c17ba11cebf30aa8da7872668efee48f SHA-256: 8293170e1f8b3489d84f4f608ec5942da588ce880d5297ef7da2235fbaeedaed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a raw IP address literal further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed15758503---josalo.pdf In PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2108272235478473133tdz7.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a161d7a101---xemepumiduti.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa88a260f50c2aadc7230477006310b2/vufinosobuvizujipejafage.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/zekegaxedomosuru.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/91098748019.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/lipagojapodajapusora.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/wojaxasesini.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/73366061425.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/63923299853.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/80284811350.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/84450654025.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16111c80eb663f---91309244584.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/11878604115.pdfPDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df25f6c794---nokagadosuvab.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/boxikejevopefiwabumuxoge.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/13278434568.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/piraralukekirozotilexigur.pdfIn PDF document text
    • http://www.heksan.com.pl/file/pupav.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/btf0p9t80e5ng5q95ngerb2gpd/79098897429.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/72dc87f583efc343879c2e495e5c4a4c/98639930487.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cbeacc3dd---bipixofoxijinapijexuwofo.pdfIn PDF document text
    • http://eternoohydro.com/d/files/buvivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=5+c%27s+of+credit+pdfPDF link annotation
    • 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_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 10372 bytes
SHA-256: 8bfd63a52e8d6397b74ef622b195ef15f7de0bed8b26e89da983449e4470646c
font_02_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 17100 bytes
SHA-256: 9ab12e86ac1d661ef2efb89e6f8a65e748d97ac8ed3d63a9a57a87fd21629877

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