Malicious PDF — malware analysis report

Static analysis result for SHA-256 a141effc6907c097…

MALICIOUS

PDF

75.6 KB Created: 2021-07-18 08:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c3a2285b33e95720802f6748d693f2a SHA-1: d9d7a41f66c3e043e91923cc79d4e466be1c54be SHA-256: a141effc6907c097d391b0a519a785b6ef23b70688edf9e08764075225a459d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e709f4d7eb---77149523875.pdf
    • https://napraforgohotel.hu/upload/file/25300584803.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6923d1f6f4---pinem.pdf
    • https://alakharia.com/public_html/userfiles/file/45546783987.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607c549b188be---7214136035.pdf
    • http://aaaexpressac.com/userfiles/file/20925633323.pdf
    • http://dunajecbiala.pl/upload/File/71265863560.pdf
    • http://myucmas.com/userfiles/file/21234372754.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfd4b30a5---80765938239.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/13bef3cdcb7fa0a13815ed0b3994a405/22205634649.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3460bbde28---82325907312.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b78bba3045d---delaxewapujokelikuzen.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608af661c51de---65918702997.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/moranirupusuvemoxesofub.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddca0da29ec---tosabomotogetugisor.pdf
    • http://smn68.com/clients/75339/File/wovemevufetiga.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/g8p1nki50pmphup3ba2nsi6j6n/45448937785.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/daginejudejomewifun.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1feaba1ba4---3163065555.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608710ff47ed7---luruvimopewuzemu.pdf
    • https://sasalidayanisma.org/uploads/file/mumiz.pdf
    • http://michellesmithscott.com/clients/36670/File/93882044914.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c519ba5fe00---matezibapafuxobax.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l7hcb1tv60vtrnrp2gtuhk6sig/gatizafagoxevoxiforipi.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/76829668294.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gauge+fields+knots+and+gravity+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_off0000c393.bin
5c10f15bb7fa688dfa8bc58d12366559c83919f3a2cd7a18eb3317d092a9e3fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC393 11084 bytes
font_01_sfnt_off0000dd68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 16792 bytes
font_02_sfnt_off0000f57a.bin
762a8ff8709d0620e821e03cc27f1140a8b9ba295ee4d15224de81964386dd3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16692 bytes