Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d05c699600c8c51…

MALICIOUS

PDF

70.8 KB Created: 2021-08-21 14:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6e6db446eb13e945c01962a5a0683c9 SHA-1: aa9b9331745adbb78d0ebdeda5c20f74347890b2 SHA-256: 1d05c699600c8c513c3022b8b469b41cd4790e65967e7f88df4caa4feee0fa88
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8234

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allmassage.net/upload/file/20210523175336.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qjkdu9vbc0cgv58aaimo4eh1s4/62077171751.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc956aaa774---jotoxometogipotor.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mr6nuqcrk1ldrhnv454cckb49q/padulisixukomepa.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/zadeloderesopofovuputu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210724134131.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/1650025367.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/93caff2a0a525e9bd0a704bb8ebffe6c/14652779266.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1423a7e8---dopavobekaw.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/un0bh0fjaq94g2mkvlr9furfb1/6420745805.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/82856236679.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/60988434050.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/vidowefapisas.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/6561491861.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210522/file/16216214456048.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4afb3412efbd079d151f5475c828f502/36843845629.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f09efe8e---55412407810.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/addbbc0f281418dcd9dc3bac6268ce1b/35206820152.pdfIn PDF document text
    • https://dvg.asia/ckfinder/uploadfiles/files/34173586576.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/48dp1gqvb86tiko80h32n14l31/batiji.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/88944699559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=travelin+soldier+sheet+musicPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 16948 bytes
SHA-256: 7df051e2d39cc667c0eda3f91b432641e2af5856ebe5c54763f16cdec78d9476

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