Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f258e6dec8f1319…

MALICIOUS

PDF

84.7 KB Created: 2021-08-16 04:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20a4db225d253c4674d8db8c8e11a3a6 SHA-1: 54e413bb8e4e28415753eff5c9c39bc4d950a4bd SHA-256: 7f258e6dec8f13192231a846e3726effe237b0bc699c5863b49af7aa3b609397
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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 https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c90d91649---xuwejebofilifebebe.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9c7fd463327bdfae8435f744eaf1f111/28606406037.pdf
    • http://gapoom.com/upload/fckeditor/file/58603183207.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rch9fl9q40pnubhogk7gh64hpu/52509965396.pdf
    • http://growlink.biz/userfiles/file/fegonitufixapufo.pdf
    • https://mwasafat.com/uploads/files/15122551292.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609542ee9520b---wevopumimop.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/wapuvifexejixu.pdf
    • http://sanmargholidays.com/ckfinder/userfiles/files/11967298601.pdf
    • http://teknis.it/userfiles/files/53868486014.pdf
    • http://pivotal-technologies.com/userfiles/file/zisaja.pdf
    • https://havanic.com/cache/fck_files/file/fuwebipepavigeburaxiwen.pdf
    • http://e-hematologica.com/users//file/29174777439.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/wositadubeji.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e147f9612a6fc2e01625db3ee7aaa6bb/32253784509.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dedabe607---91728198085.pdf
    • http://baigeleather.com/userfiles/file/53527219312.pdf
    • http://petra-dario.info/upload/datoteke/10254031673.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/19676569184.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/87758133317.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff482bb463---rozuxikavodaf.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b22108b4175---1196210726.pdf
    • http://centronegozi.com/public/gamugewuwukafilefutufe.pdf
    • https://villanakarin.com/userfiles/files/20814815658.pdf
    • http://growlink.biz/userfiles/file/16643170586.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+half+blood+prince+chapter+17
    • 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_off0000e60c.bin
d39b92161f77d96dde4fadd6232d38655268f23380cffc806a123ac630ab8c21
pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 17384 bytes
font_01_sfnt_off00011303.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 16792 bytes
font_02_sfnt_off00012b1a.bin
983493c19986d95897913c53a3c0ef56808e10dd932d8f36e5a64df006aea56a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 10896 bytes