Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a43f364f0a944c7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 21:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9236d8750cbfc910ef9fdcd2c7e3128d SHA-1: beb6e758f480e6365b3374a0b04c7fe9d384ce3c SHA-256: 4a43f364f0a944c766dfd8f384c87d12505fd6e61052d456c4064181d43d0754
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious actions within PDF documents. The PDF also functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing or to download further malicious payloads, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6004

Heuristics 6

  • 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
  • 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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876dbf7aa95---dekazilonowodutafed.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989053afa8a---75270494721.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f622c88f3---87877004245.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/suvunoxabawaberalumu.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210801055817.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a751775fa63---pujomenomajo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2394e4da5754ebd8358e4a0c7f901378/lufolugelavovapun.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/91464220275.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3ffbb62e---51938800470.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/51809216018.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/64683325445.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f4463e637---99565945113.pdfIn PDF document text
    • http://ruresept.ru/files/file/42925596494.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610afacd279f1---1547169304.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cda848794---16804333418.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b65abcd7a---sudonafojejukavodimexame.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/53346462560.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/dawesof.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/74681726594.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///35320935223.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3c2e3620---24104281880.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3ef7758aeb3b7ce5d88aee4eb70561e7/zedifojeziki.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/sovasekelepafejofimatejaj.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4a41ba2ae4570bb7180245bdfdf18240/8886931261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=psalm+120+commentaryPDF link annotation
    • 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_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10708 bytes
SHA-256: 0bd896567a9baf856c6fbdb6bd70335a9437580c10b3a785ef6cf2a902accfb5
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 18572 bytes
SHA-256: 03415ff6e62b26392ef81e19fbda1bcee460e0aed23a2ef4f11907f725b5c9ef
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1