Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0daadf8af9a1e40…

MALICIOUS

PDF

90.1 KB Created: 2021-09-03 16:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89648b892bc22f66ddd74af9916128fa SHA-1: 5d4f08fd10effb2bddf093d597706ead1e4d2c97 SHA-256: a0daadf8af9a1e40c76c51b63d5212e8e6d9758b2ccb7b717b9091b2ee602aae
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers have identified this file as malicious, specifically as a phishing trojan. The embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://thietbimaugiao.vn/Images_upload/files/62515049371.pdf In PDF document text
    • https://ytdrive.com/CKEdit/upload/files/vuzururavi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/30218a2516d424d0851967815a5d3f23/ragomibagudorukemo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xidojufogabi.pdfIn PDF document text
    • http://abc-tel.ru/data/File/zesimunurumaruwezo.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/68007107732.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/93638063312.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/dagojoga.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/mamuxenizidu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2baaf44c---zitel.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/gapaturiber.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b0e6e74b---13269951988.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/11464955515.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a691c7a2b42---31464466135.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/64320102805.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/8035791343.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/nexag.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/l4erhdbilmd441cq5ejum52af4/karagukuwa.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/32881966416.pdfIn PDF document text
    • https://bak.vn/upload/files/zilebekibebubo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/69845747402.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3e7b5c1bb---76033252007.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108292110114967.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/rosijirizabobegel.pdfIn PDF document text
    • http://slsnn.ru/content/file/fetirezivakezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adverse+effects+of+vaccines+pdfPDF 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_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 18492 bytes
SHA-256: 29fd4ab0a0cde3f8ec354b45f1870aee0d36a27610bc4c0a32be6b7372707799
font_01_sfnt_off000136c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 10616 bytes
SHA-256: 739877e9a7ee28050ca7d05026e1a60e296cbda51f6616222b97087753807228
font_02_sfnt_off00014f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1