Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46f8450548ae412…

MALICIOUS

PDF

88.7 KB Created: 2021-07-24 12:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 924ab6518394b382885e34aee558196b SHA-1: 62755bad8cede6d5fd9900a468d6b61385512aed SHA-256: e46f8450548ae412049f2a512a4a68dbd1411dc53768adb617bc88a40a47fb30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ljlconst.com/admin/images/file/vuzuposano.pdf
    • http://silesiacapital.eu/data/file/62873015824.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3447b24627---37716037610.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad31103e2eb---xirupovusozoga.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609680c15ff66---98301538225.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba758b3efd---48764861105.pdf
    • http://akcjonariusz.com/UserFiles/file/puredeto.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/c3gpeqtki4rkemclg8kiina5jm/zajipozixaviveropukuzoji.pdf
    • http://akkoryazilim.com/userfiles/file/jurajawuvova.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086a31102d6e---vovixebarerufejexoxa.pdf
    • https://balajitutorial.com/admin/userfiles/file/ragadup.pdf
    • http://edwardlankin.com/clients/86087/File/90341495976.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wotidemuziladadaku.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210623050108.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dbc8df35e---43571087144.pdf
    • http://esoftland.com/userfiles/file/pibegewe.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2130ec3d1---rulotori.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b6aa7fe2e---14948606781.pdf
    • http://ourgans.org/userfiles/files/fafofuna.pdf
    • https://sindonis.com/userfiles/file/36504491483.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee85d3de714---meroleduxodejozuripekom.pdf
    • https://justbuymeds.net/userfiles/file/loresexigujuwafowok.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/verugaxanutez.pdf
    • http://ud2-140.com/files/ruwozotetemiludarozonexi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=maulana+jalaluddin+rumi+poems+in+english+pdf
    • 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_off0000f7d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 16792 bytes
font_01_sfnt_off00010fe3.bin
fdd3c4e59336b20af6bf416411997b01f3c7eabc981d7963e8b401a157b69bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 16736 bytes
font_02_sfnt_off00013b2f.bin
10b0e1cabdb16e961b5930f5c9b2f1d440248df8287c71ad9d15a3d7ffdd039e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2F 11068 bytes