Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec35d2c6a87c134…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 23:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ca1919a231785e35da8411c68bc6708 SHA-1: 9aad84a7623140d7f22be06345cd9130c8f7cd2d SHA-256: eec35d2c6a87c134ca99dfcf4afea01700c898a4870da69162dc8fb42e58bb68
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload via the embedded JavaScript and linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://coretry.ru/uplcv?utm_term=how+to+restore+text+messages+on+new+phone PDF link annotation
    • https://agrando.cz/files/file/jupamotexanola.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131121593cfe---48009546429.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/96924029302.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/zedim.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/81467359901.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a27c3937---duwem.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/bigdtgfp5bd83cmdcfj83ks957/56350113351.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109121503574681.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161341bc0a97c3---jefatevopasegar.pdfIn macro / runtime command snippet
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/43848045219.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/38139612032.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61336bf941768.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613202c4bcdae---tubijop.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/8245548070.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/wafidu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/waxisonuwuzusefibazulixen.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/seguxeloveg.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/87853128444.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/xaxiterurag.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/37374607203.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/kawogalodorevolema.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/63680699166.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/24661524092.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/fIn macro / runtime command snippet
    • 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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 17904 bytes
SHA-256: 5af7e943e22f573e3d21065b7de83bc034d10c9ea790f3961ca6555ec14cae8e
font_02_sfnt_off000128a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A2 10740 bytes
SHA-256: 450d26538a31e703f678158acaf5850eb3e38ed4177177807dead65dea4c22b8

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