Malicious PDF — malware analysis report

Static analysis result for SHA-256 99931d3c5798027c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-18 23:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1525ee07e261da6cefb1121ca669d1bf SHA-1: 582adb7135899fa46fe0c4ab7dcc21dc4000d67d SHA-256: 99931d3c5798027c7a9aa8ce516f66e0fae96b6c98a0de35762ea139d969bfc7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and link distribution point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6306

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://smidgel.ru/uplcv?utm_term=simon+vs+the+homosapien+agenda+read+online+free+pdf PDF link annotation
    • https://bank-kredit.at/ckfinder/userfiles/files/tobanijabakataxinereku.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109131754342539.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/28292872289.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/nixapiwaginaza.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/jopuvurozera.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/14531814218.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/96979997933.pdfIn PDF document text
    • http://consade.com/userfiles/file/14158087199.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/xasamijawipano.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gegawul.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4868b7a32---12065324112.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/ruratizexe.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/14712541378.pdfIn PDF document text
    • http://valeneighbors.com/userimages/53303470440.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-08-12-22-37-22.pdfIn PDF document text
    • https://intersat.lv/files/file/kifirofumu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317a399e7e1---biwuzir.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/47997703787.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4488fa107308d6400a15c7271bfcc676/worabijiwapaludufepaje.pdfIn PDF document text
    • https://anfauglir.com/images/file/97276253094.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/gapodat.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/27242006ce961342ff5b24c7d885e969/70477677152.pdfIn PDF document text
    • http://xprchemical.com/upload/files/76977174668.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/50729331337.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/16418837618.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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