Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf80ba7acbb519b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-01 22:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f4cf6b88bfbe2f08a044bc59bc107f8e SHA-1: 93e58bcdb8f0ea25fa1f4fa45858f571f317b5f0 SHA-256: fbf80ba7acbb519b131e9d7170fe678dd2fbe19c3b8a42e3b15961eb619b86ab
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to distribute further malicious content or engage in SEO poisoning for malicious purposes. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://fallsplat.se/file/xiwineluvisujimakifim.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/f6eda452fd35c459899e530cb7cb2b46/74039495806.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/nutejizuwo.pdfIn PDF document text
    • https://medicula.pl/web/uploads/files/sujaduxuwutokowuz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091947668be5---fufuxafogotezupalo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60a957a2b---jedoviwakowebiji.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609046aa72893---14602838550.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878205ee1ec---gupidukekeneroroxa.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/39163594756.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/17121944691.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/12525631066.pdfIn PDF document text
    • http://ivaco.it/file/76198693465.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/43264790994.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/fuzokeg.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a27899f5f0f8bf3cdbcfae6977cbf67e/lerirowowejozexufale.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0ecd0a81---91290207624.pdfIn PDF document text
    • https://limsurdua.com/contents//files/62879892684.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-28/20210628234513361529.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/85ced3b72cbc6e8ded1ac9d73ee0b449/letupizikegu.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/medotitiduxixe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/964c3ebeecfd8d315d8b243729761cb7/vupuwagewedesasivalejo.pdfIn PDF document text
    • http://www.pilartangguh.com/file/dujetuloroxoj.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/tatagefopawexinufes.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210801040618480259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tamil+dubbed+animation+movie+free+downloadPDF 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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 16996 bytes
SHA-256: 0fdfede68a4db9955f0a18bb68d6d547082cd4430d20d15bd70dfbd4a9a4d975
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 10704 bytes
SHA-256: 64d5f410981859d219ef04cf214fec2f0d648a42febdd1987cee15a6bc2dfd79

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