Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b267eb4e95e430…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 04:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b74bd641de5140747775eb4259014213 SHA-1: 6e27316eb3ef25b78d7e1bbcf76848e6c761ea1e SHA-256: 90b267eb4e95e4303ba697ca7cc14fb9883e1da975a6dcf23a219038cb5723da
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The presence of multiple links to potentially malicious PDF files indicates a coordinated effort to host and serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613967505fc54---koximelivodejanakutaz.pdf
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/65941094663.pdf
    • https://forexinc.ca/upload/editor/file/lunimifibexikozifibosumi.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361dcdf1b20---80176202452.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132b74148c20---18547024515.pdf
    • http://laserbeautymachine.net/d/files/29817685914.pdf
    • http://tercovci.cz/files/file/89300334105.pdf
    • http://musicpark-live.com/userfiles/file/15739109388.pdf
    • http://studiocariola.com/userfiles/files/59593895948.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131079be5245---sisik.pdf
    • http://ykzn8.com/upfiles/editor/files/liliwexuverixela.pdf
    • https://implant-drill.com/userfiles/file/gafofapelel.pdf
    • http://exdebt.bg/userfiles/file/gifozugij.pdf
    • http://12shio5.com/contents/files/faropatiraxonomuj.pdf
    • http://smepil.com/ckeditor/userfiles/files/godexomuvixuwosepen.pdf
    • http://apmnir.ro/fckfiles/file/fabetevozazenukewug.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/rudarozowaxas.pdf
    • https://lombardpruszkow.pl/local/userfiles/file/zirekosovurijubosef.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb2b8a95b---xarimu.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/81082313098.pdf
    • http://velomagazin.hu/UserFiles/file/supudotarasamowemaw.pdf
    • https://coffotea.com/uploads/files/202109071527142741.pdf
    • https://idea-web.ro/app/webroot/files/userfiles/files/xizawekuseveku.pdf
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/nofen.pdf
    • http://matsusushionline.com/uploads/files/kolalid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=smart+tv+43+inch+price+in+pakistan
    • 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_off0000f6d6.bin
3b8cec864b11f24d937d04c7f7f333fac24e8c2d7e143283223eb1121ad8dfb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 16616 bytes
font_01_sfnt_off000121d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 16792 bytes
font_02_sfnt_off000139f0.bin
417b9a47ad48fe50623a418ed8eedd7b687248d727b114c4209e49e90d791ecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x139F0 10956 bytes