Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72090bbece1aff6…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 17:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0bb5129ba8d69cf1ffc3479fe73062a6 SHA-1: 8970636181571718d2cc6b2eee13be97051e3522 SHA-256: f72090bbece1aff643523712d943c03364cbca1099aab1c1169912ec58ba152e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://swaptoys.org/ckeditor/uploads/files/97055262679.pdf In PDF document text
    • https://svltv.in/userfiles/files/25285895556.pdfIn PDF document text
    • https://gsc-tw.com/userfiles/file/jipivasekumawigowimopiruk.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8891662e5---60222989896.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/37792520775.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/49663778753.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/bezupedowunemevanumawi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139945b58da0---xapovozadebuz.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/10932069718.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/12627025643.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/mimejesuwinodapilif.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/81306220116.pdfIn PDF document text
    • http://tercovci.cz/files/file/piseguzisefepesemekufi.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210908_012638.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d9ed529f717ad7c097bca190c91efb0d/terefozijapesavi.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/3162968594.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/12034454164.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6863cfcf0f5a5e5424c5b74b51b0278e/nifomujigukaba.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/13221597602.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/sasonunuxesum.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109181604458886.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/37628936820.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/rigegaxesezumeg.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/veretomisareletadato.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/30759099633.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/7128429809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cute+girl+names+starting+with+zPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000b0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 10712 bytes
SHA-256: 4d6f58d682c70bf628f4c98f64ca5dd8e3a79f0abc1da36e2caa63e5da945b9a
font_02_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 14660 bytes
SHA-256: e3b5210445015743b53728221ae9a040b64e35cf0ae8cece7134f16d553f8fd1