Malicious PDF — malware analysis report

Static analysis result for SHA-256 453f7e364c2aff28…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 11:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed1b752f11b04a98998f7e8ac8363dd2 SHA-1: 7328c8e175d952fe5b7aea12475a85f2473206e8 SHA-256: 453f7e364c2aff2802d1d50b82350940ddb9fa054b28f52fa2c0bcdd604882a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. Heuristics suggest it's a phishing or malware distribution lure, with ClamAV and ML classifiers confirming its malicious nature. The presence of multiple external URIs and link farms strongly suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2c4c071731fc506ca07fd30695fbc899/3970585457.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1294a0cd---bogajesuxiro.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-21/20210621030006482031.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giwenele.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/mixij.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/masikebofujokipesu.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/jaxedoposan.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16128e166d9d9d---35425324814.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/depovogopenopo.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106271046399044.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/32815364400.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0c69bb75---39928117217.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/xetolaju.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2139a14732---pozapid.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/wivikives.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/20576411341.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/69942475071.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/80347391490.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/47339843107.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a1d283c59a99e46062677c76798a462b/retujebowowadetib.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/2323831259.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210821053521.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe7dae5064---93547014538.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae005d85b6c---tirugapavuziruba.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/356cm9daj7idh7jar1kak100r5/tujorumenimagez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sample+business+plan+for+poultry+pdfPDF 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_off0000cbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 16536 bytes
SHA-256: eb020e948161483b6e2bf2b1b244402b469e2b346c816458cb0e3d8c54fa49d4
font_01_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 11088 bytes
SHA-256: 8beba4073603b14c99fc0c8160b7d8a879a1cab81147f739f700209752bfbfd1
font_02_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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