Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e8ecea29fc09f9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 09:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6871b4f330876d49c2a08e875ccf215 SHA-1: 355c8413e102d92845acbd8972393a73fdc9e37e SHA-256: 20e8ecea29fc09f9cf1bc8a7cf5b148577131ea3315696ac424a8199fe10b698
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://salsainkonstanz.de/media/files/64796443915.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e1b393e8b084d8032a4a9a178b331a7f/55664410706.pdf
    • https://worldmedglobal.com/userfiles/files/tifonevarep.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/365cc303525e62fde168e05f74276e7a/jimeloxofonakozanov.pdf
    • http://pokebarslo.com/uploads/files/7419077786.pdf
    • http://usa-ex.com/images/blog/file/vifituwetafiw.pdf
    • http://alianzablue.com/aym_image/files/vuxapetomabi.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c7033cb9---tupafoxofubujed.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0dfd4e43---gedufitasisax.pdf
    • http://capitaldanceacademy.com/userfiles/files/57385619316.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f213ca7331---44233609791.pdf
    • http://megatex-plast.ru/pub/file/kofasevavuzuturota.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/441cd4dba5a48c2d11afef4877a8d36e/rijaduxifubibezuzitoti.pdf
    • http://hotelbellevuepalermo.com/userfiles/files/64963961368.pdf
    • http://lednotice.com/userData/board/file/rujagebasosi.pdf
    • https://beruanglucu.com/contents/files/gidetelokogib.pdf
    • http://ruiqingchem.com/upload/files/18577376636.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/48040239145.pdf
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/vujapezalegenimanor.pdf
    • https://voyageaventurenepal.com/upload/files/25262465939.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/rapusegolobawa.pdf
    • http://jatechkj.pl/upload/fck/file/91244443076.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=redmi+k30i+5g+specification
    • 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_off0000e1ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 16792 bytes
font_01_sfnt_off0000f9c0.bin
9edca0b49cdcaad1a8ad7c6a9cbc135541b37a26b052052f2254012ce0b8ed1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 16260 bytes
font_02_sfnt_off000123fd.bin
3fc6de704c5c1e2dbcd1dbfca0e422ccb6c0826679e6b48271e82a288669f1df
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 18612 bytes