Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b2ec72386e8055…

MALICIOUS

PDF

83.3 KB Created: 2021-08-07 15:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 825db094c35b37604c0957b36869265f SHA-1: 42a11dbb23d319b85b12e79389c2750b2cc4d52a SHA-256: f2b2ec72386e80555e7aa130f2a9570998b8819ad1f1693f633568cac3a21fa5
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to potentially compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/15070344270.pdf In PDF document text
    • http://kruengrangthai.com/files/files/82487643063.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/78553832514.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///87236339832.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070511135539.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/goxobadata.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/60985070154.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/72033114761.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/818aa2ac105e3a1725fa0d35db9c7c23/xomidozimunojusasodenoxa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c0f14ccd---rajobamunedazexiju.pdfPDF link annotation
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc23c2b18---33129196983.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/safoxazadike.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/lolodetevetewevaxasunas.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/65485424138.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3d879202b2fe631f8cb60232f38c81b9/vowurevarutapesivalame.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/padaxodoz.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/xopipizeger.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bd3bc4ba---vatuja.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/dojabamexomonerifemef.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fi3vusbi0e3ffl6d2ufi40drj4/70251638483.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160730dabd52c6---kexomofutuwawarerez.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/24860590381.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/95574495136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chemistry+matter+and+change+chapter+12+answersPDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 11200 bytes
SHA-256: 220d5fa7f40aa86f76b694417b3fb06d282c585f66ff6eda5174dabd9ffe5e5b
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 17324 bytes
SHA-256: 847ec22d02b40cc1a3881bdf7a096b35a58647dfd7401230c26cd46d26c828f3
font_02_sfnt_off00012786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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