Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52d10c6c1662e58…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 23:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9e613bd745a86c4afb5a51b70d2d6827 SHA-1: 8ae649eb4143a4a5160b430459702505176ddb93 SHA-256: e52d10c6c1662e58bcc3306c8e79128ecfbac24150c7ac4adf3fa1cdce3d8f01
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 http://infinity8talents.com/userfiles/file/88694711177.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/10964637910.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kunevukepisofagekodi.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/36599516661.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd74c8247---89059741693.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/vaxidufuxotovororexi.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/59932252261.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/lulutumakurikesozoxigo.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/82194541727.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/17456880310.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/30702750911.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ab98f2d0f---lezokegifebugufojixa.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20710597244.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/wanisidavetijuru.pdfIn PDF document text
    • http://terlickodds.cz/www/www/fckphotos/file/wifetazogajerumidin.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/23a1549d99ea62f15d7198ec83d2ed06/sesukobatotibilazuj.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/79491964207.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352fd4e36f1---pokowabojine.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/sotedadorotazesowajer.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/63733787356.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/26130556081.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/51541613908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=counter+strike+like+game+for+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797fec5afd---duxojug.pdfIn PDF document text
    • 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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 17384 bytes
SHA-256: 11df6b02d7c17c5155e5f69ae7f80994e602b848af7b46f3889a46b37e4aca44
font_01_sfnt_off00011b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B98 10920 bytes
SHA-256: 9c5c0024b48a54ec67cbc2c3f9407153368b4fae381ba271818e95fa53c9e020

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