Malicious PDF — malware analysis report

Static analysis result for SHA-256 5366187fa0c5477d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 13:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f236395ae4eb4fa01f72f63ef63d7db9 SHA-1: aaad9ba8a1e7d3545409118df960d1ae37fbd5bd SHA-256: 5366187fa0c5477d720610927098ed7d6add9ec3cb9eb0d49b41c3d1c95bd45f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for executing the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://houstoncoinshow.org/FCKeditor/file/vafesob.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/db1a24d2bccf529fd25859644a6e8d67/1451755049.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/43590490038.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2ead5080d7d91a4ab886cf08eacc063a/33971465767.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5nt1i803ce76g2ooegn232eupb/88081072359.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b503096ffd25c19d155803534ada2648/xodiduvotunusi.pdf
    • http://ligneus.hu/upload/file/dotonuwawerapomekewagerok.pdf
    • https://atphp.ch/userfiles/file/wapemeteme.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/minemijoboxusirasutoxiteb.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c34e37209---tomitoxuboranoxal.pdf
    • http://crm333.com/documentos/file/moletixekawelukexo.pdf
    • https://viettincapital.vn/upload/files/76340093718.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef983b5a61c5143ef924b80f0697da15/80952057821.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c636dc1bcf5---73601992568.pdf
    • https://t2sc.me/userfiles/68658320876.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9959e738---68025377951.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/dexevuwowixaz.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712aca7bb2---2120240914.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/vujopav.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/51513785127.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3bd9fd9fde4647b22e57217a42fc2cb2/21314505876.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff295a7a11---90588065370.pdf
    • http://daieimotors.com/js/upload/files/93286624423.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160cacdd341c77---zixon.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1807d84d09af4bfea10980984e25e33c/17638775470.pdf
    • http://benthanhsgfarm.com/images/uploads/files/26745774972.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=snoop+dogg+dr+dre+piano+notes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebed.bin
a99b8649337decfbbb90869d8bd1bbed103daabf9ffd0109f0a049fae113dd79
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 10596 bytes
font_01_sfnt_off000103fa.bin
1e350039791e73c3eefbe191a9d981b5b53511ac9da75e758801e16de2d7799c
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 18520 bytes
font_02_sfnt_off000134f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134F8 16792 bytes