Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6e41594bf4938d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 21:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd3dc6156b44e24c44b64f3edd2fbd91 SHA-1: 7619dbe8a95a00ec2492e81298dcf7a3ef21aaf0 SHA-256: 0e6e41594bf4938d1ed8c8d9a91885de46238bd5a2b6e6703fe43e5092c062fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=descargar+el+libro+orgullo+y+prejuicio+pdf PDF link annotation
    • http://asvpp.fr/pdf/27633234285.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bb39309551c212578c5818149944b2df/bafana.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/b0d639bd196609b491170079abff94c7/56361226672.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/76895642675.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/693628c2f84e0faf183775db3957c118/belojuzi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdb20d16e---zotisuwotikokaropinufizol.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/5258140798.pdfIn PDF document text
    • http://gazetavk.ru/img/file/mopizufekipeluzogililesa.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/akuzurigefelemowudojugu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6659c7d55c---39366200648.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76df98229---14965964347.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89f5914457---70723284021.pdfIn PDF document text
    • https://tavio.ru/files/file/3733397697.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pakalojovofoluzoloz.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/lpgn73ol3taqbub4idj2bdrgv4/44430549996.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/julusabud.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bce31d605---85647511301.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/wepatobopekidubulizosu.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/3ft0hp8pniggtr2tla8ptfgkbo/palalezaxovajuma.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/27048778729.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/29886523648.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/xuwajalijuzijas.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f8fcab9ced46de7dfa0099e298795e78/80000683036.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/89038206602.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 11076 bytes
SHA-256: 6fb42f2ac51ec06b70bb4d8803552827557f56a4824fa88050b8d72688c2f267
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 19076 bytes
SHA-256: 856cce4192719c38dd5fb13aa2986a3e75130123c8367a7d2ee214ddea6bba42
font_02_sfnt_off000134ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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