Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53ea1d2e1ba0a5f…

MALICIOUS

PDF

71.1 KB Created: 2021-08-28 01:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b5ba3d1fbb8218a424beb8b4dce293a SHA-1: 893175bf6fd962f56137427deac062e5045c82e0 SHA-256: f53ea1d2e1ba0a5fd0d23314060694d4ffd009ce342919960586f9ef4e2eb1aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the true destination. An embedded JavaScript stream was also detected, which could be used to further obfuscate malicious activity or redirect the user. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.lnk-creation.fr/upload/file/11085442461.pdf
    • https://fenicia.uy/fenicia.com.uy/uploads/files/raxugawejeputanetu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jag1vepst73ig34dmbvcub10st/6902637086.pdf
    • https://rcot.org/userfiles/file/35780590242.pdf
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/dunixedufavoketoze.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608715a76ad91---94526279126.pdf
    • https://vivekanandbawwa.com/userfiles/file/newedid.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/34854517786.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/kigaxonumajisadagupazam.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249ffc0ed7---vetewanulogalatodifu.pdf
    • https://akapacha.com/userfiles/file/zebutizutabewemanoregena.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/9379060785.pdf
    • http://paillasse.hu/userfiles/file/jigipif.pdf
    • http://shinies.ru/img/lib/file/18702747853.pdf
    • http://fitviewer.biz/files/file/malavexemivevozupod.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/bupodusajuvuvigudutapupom.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vkm5gr3miotb5ft06qk6644br3/medikakufenonebefeto.pdf
    • http://zentrumok.com/userfile/files/numupefabotavogubuj.pdf
    • http://yuc-fac.com/uploadfiles/20210708021406.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c777a5c5---99029137151.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb307b3f0b8---39129327937.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/gmlnnh4a294neh2mo90jr7l76f/67825611224.pdf
    • http://logtech.cz/foto/Image/file/rokugaxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=roblox+gift+card+codes+generator+2020
    • 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_off0000b53c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB53C 16792 bytes
font_01_sfnt_off0000cd53.bin
4772aeda6037bb539dd9c8ab8991209c1d74557e19521731f6a0a8b66cf4eb08
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 11180 bytes
font_02_sfnt_off0000e77e.bin
2d743c63adb7efaf1fa29b523646a9fa0a9b92603d4112d13b54935544be0bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 15432 bytes