Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a0026795dd1b17…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 03:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8db60fafaa9f5921a68b19b63806da10 SHA-1: 8ba72dc302c4bb23feba4e17c733d4e921b68534 SHA-256: c8a0026795dd1b17955fb0dd6154c415a871e3b4db8bb4edce7170f5e27140b5
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 websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nikosdimos.gr/userfiles/file/85232416159.pdf
    • http://daieimotors.com/js/upload/files/fefavumefoxewidin.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160928194cdc98---29761136564.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/9ef29726323c19e507592892325e920b/luxitaxog.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2a89b35226bcf2c35161e04ef0de7bf8/dabuwusofebemu.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/38480874223.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd27485393---6090214597.pdf
    • http://kesherisrael.com/uploadEditor/files/kureporopi.pdf
    • http://bright-mineral.com/uploadfile/file/2021051807444369.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b5743896f---zilotuladot.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098afc278a6a---rinejefe.pdf
    • http://abogarestudio.com/userfiles/file/1674311461.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6dc4234b91463bb085994d8fd1714d98/ratej.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bed60a68---tipodolafuturukurinurawa.pdf
    • http://euro-ex.net/images/blog//file/girizetokulenatenomixe.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429040056247808.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e6f4e734f---tanotowokitoso.pdf
    • http://extracam.es/app/webroot/arxius/file/91685266059.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/rerirukabap.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ef2u3etb6naqejp59idfc6r25a/vofumoliganukesipe.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aef314d5d---30126971885.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609927909af38---tojinuvape.pdf
    • https://iamtimeshare.com/userfiles/file/foneju.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb6756774e---76796610592.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=faux+calligraphy+practice+sheets+printable+free
    • 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_off0000f80c.bin
3b7be323f4a0a18b2b5199006088326be21a95bff405ae14c449b98d02b9ab28
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 11072 bytes
font_01_sfnt_off0001119a.bin
585de6f8fa08687b35281fc4d7ea97883574d12ec23172e3c899983709887293
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 18384 bytes
font_02_sfnt_off00014116.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14116 16792 bytes