Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d316068a05ea04…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 14:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a294a83499c8fbefebdc58afa91cb49 SHA-1: eb8cc280721213b7bf0a240efe5e98239853575a SHA-256: 51d316068a05ea04f2392222545f680013b021d02efc138fd84bf6acecd42892
164 Risk Score

Malware Insights

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

The file is a PDF that uses a fake invoice lure to entice users to download it. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jvcc.cn/ckfinder/userfiles/files/210625151822600764ng8kg.pdf
    • http://www.deco-interieure.com/userfiles/file/matorokofotivetotugobuked.pdf
    • http://africa-emergence2019.com/userfiles/file/66907680687.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160831f160ecf8---zizitaruvitijogifadabus.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2628b225e9187c2809574aff840dc039/38012284494.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070870695d8c---zagepanojam.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ab7377cc8095f807d684beecd73d5701/wanadujamezexudotu.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c40512b5158903ecdc656572be40f37f/sumowiziva.pdf
    • http://lyzebrno.cz/userfiles/file/xelojawizuva.pdf
    • http://rencontres-icare.org/userfiles/file/vilitatafo.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/38d94328c3cc97baaf8dad62b99a5f20/sijure.pdf
    • http://slp70.com/clients/873855/File/toxalogu.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f264f034---telitugedabunopuwezuza.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/10a6b399f4f6d13b7674f4817d9cf84f/naxawosusagowiw.pdf
    • http://nw-line.ru/generic/uploaded/71182753942.pdf
    • http://jrpst.pl/userfiles/file/16030161560.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5d01abf7f5b0ede19101a36e2909b5cd/44940528894.pdf
    • https://samngaimarble.com/html_upload/file/96842709087.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160becb6fda76a---39016092753.pdf
    • http://acpiindia.com/userfiles/file/ribekilaxipojomubepomu.pdf
    • http://snap-drone.com/userfiles/file/90840086367.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1908e50af---pufuzikomaxareko.pdf
    • https://cakenepal.com/userfiles/file/63189391932.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8411c724a8---38215117645.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=accounts+payable+interview+question+and+answers
    • 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_off0000e94e.bin
c2d7f2faecf36a76e67212c8266e1ea67791c5cf59acd2dba2dc9e949266d808
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 16800 bytes
font_01_sfnt_off000114c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16792 bytes
font_02_sfnt_off00012cdb.bin
286225fde94f3fc8f04e6cd0ec99c2b14cca020708bdcb157ebf943668c1c41a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 11140 bytes