Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d871b59e83ceb5…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 22:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4fd05169a1648f96dcb8cdad0286cfc9 SHA-1: 13d39a9871f1ea8fdb3cc0367c1dd2bf5322c5f4 SHA-256: b9d871b59e83ceb53299f628f215b8bed95859cfcf93275c9c426c6be577b387
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9333

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca34bef982---47559800851.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f9o0f48pe9uill5tpnmbi6u8f1/74759835219.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/pisojebex.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210625142118.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b59547ad---74301454192.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ae1c1ed585b95c8916900f68b0f32433/takom.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cda9fddff10---47577534245.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084031f49d13---kitelusagimusakamajitubal.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/68637925576.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083317d91946---xaduzinoliwarip.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/99429005506.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160757387ad2d7---lubibofutigasemawiwisa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tinenagedovifas.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f229301217---popotil.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/74dl0j3ms3mv14h930sd3lfssf/nazele.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb3ce6259---kunupom.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/27856743765.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/zagewiwifokutarug.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ui9u3omtr4fes8odnoap11vktg/23564210985.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18300cb40---82059574266.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba37aac8f5---81360370522.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b83dba389---69760441668.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a340b14f18---somezukisokaxutodip.pdfIn PDF document text
    • http://strandedtattoo.net/file/dekosiwugeloposuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cracked+clash+of+clans+iosPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 17320 bytes
SHA-256: 4980e80b0ff4ffd107e7d5bf23daea859872715f90aa2c69854c447f115062d0
font_01_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00012e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E45 10600 bytes
SHA-256: 69c98ce135752da72651a3c4f07b298f5f146b8cff420fe37af58ae2ee61d51d
font_03_sfnt_off0001466a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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