Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28059e0baaf4113…

MALICIOUS

PDF

97.3 KB Created: 2021-06-30 11:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daa43f6d84510f9fa8fe8132f417cf14 SHA-1: 249ab849e02df050cbadc9af7311b067f16c1cd0 SHA-256: e28059e0baaf411331d6a19cc7ee8108f43ac5ea6bb7d233ab567cbf22fc2f0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=globalisation+in+business+environment
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4627abd578---17717999753.pdf
    • http://musorcentrum.hu/files/article/file/3705951889.pdf
    • http://files.ibiza-ferien.de/file/45272119324.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/bfb58807a42fcef89e748e93cd1453f0/zokexixupiregasasituni.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb18c7ad2a---63439775293.pdf
    • https://baptistfriends.org/media/64360258697.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ed23c43a---tekumamobisezapalowuwate.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ecb0a1d7ecca54bc281d2934fe9f70be/45904504122.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/76d41e467e3fe74bf742bf7f5b0c3760/pijifasinaxevegen.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27c2c26d3---19268594312.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607232e4c370c---46008060308.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4c9f972241aa8c3f6197dd62f4d6bf36/jatirulevurogifesugid.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607444ccd11d1---69996927734.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e053a6afee---sovegagamutu.pdf
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/nalewatigafobopiwoz.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/xenaxivixasile.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc789b09a8---9571092771.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210514060734.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f093ee9ffa---roratipo.pdf
    • http://myucmas.com/userfiles/file/dujixujolejet.pdf
    • http://www.puhito.hu/uploads/zewefowanarojanukokaluduj.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/16fb88d21aa42062ffebd60ebd9002bf/mekefomonamaviloke.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s7gqret7rj3qsjasvclff4ubn6/62073817624.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_off0001172a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 16792 bytes
font_01_sfnt_off00012f3c.bin
047b2a71ba574c0e3fae609e5bf3e14a9b68512f875750baa0f6c02a3bbfc8bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 17684 bytes
font_02_sfnt_off00015db2.bin
9a51ca4543966516184c1f9394342bd16e46aa4839a32395cdef02a8624de129
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB2 10616 bytes