Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33a7d3e1ff83be1…

MALICIOUS

PDF

68.4 KB Created: 2021-05-10 07:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f0ae946640a4f2a87d8464092c8052a SHA-1: 9ff34ec650b73742c3d9a46582fb2215cb4308b3 SHA-256: e33a7d3e1ff83be1e5cc5d679cbdcb00590d4029730c58350a39cfb085e64cf3
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 WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daca050e3e---4795212710.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8b3a1d68---14641926840.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a535ef76e---43077802773.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c4081ee6---vudekalonavoxiwerebu.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/016d8ba60b22f24c02ba8127d3ce2860/13081771412.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb2a01907---zukow.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/892d67d75596982a69320e67ab545ebc/falifukumozagotinedejaso.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/92760162a48502907f1f3082d0703ae1/27542227774.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098761a56bb1---puwenuguniwep.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eda5e8ef---bevodatubaneni.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e991b284d7---rajegedegazaxuji.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb8ec0c62---21707058005.pdf
    • http://alnadaoil.com/userfiles/file/13472497341.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849b1b55763---38115015641.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160979533b9aff---jojatorudimapesugiwunuf.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d465d3449---rerugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cursive+handwriting+practice+sheets+uk
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd81.bin
c81cfbd38d5a84b36a9c834bc9fae30bcb093418ad7b447ba9bd3e3916c2a672
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 5424 bytes
font_01_sfnt_off0000e007.bin
5d99d72eca2d02ccce59127cf2aff434818c553695de24ff7a08c6d2c9d6feed
pdf-font-stream PDF embedded font (sfnt) at offset 0xE007 10020 bytes