Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b96125ee8a299e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 07:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7b8bfc6e88edad22ceb7bbab792882b SHA-1: 2a730c5ffd7bc8729ca70d70bdd8fb8789e3034e SHA-256: 91b96125ee8a299e1aa97b240ea12f4d192930914797f97f0f1c0472c6a03db1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable domains. This indicates an attempt to host malicious content or phishing pages, likely delivered via spearphishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ongxoanhdpe.vn/upload/files/venezilenisabexok.pdf In PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/zasogabunesef.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/45496039271.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/4760020402.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c425deb336fcd4daf5f9bd9830c52e65/tamozapafalawur.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109190751037429.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/vogikilulekuberese.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/20984963433.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/43372709700.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911181541903085.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/jawogitajifaril.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/6837223386.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/48552332613.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142b3e08c9f6---zaxabuwinowedatojawuj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ab7391e4---logidudiwatinalano.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/58498446420.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/2378907632.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/ronixa.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344529133e9---45928314117.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/66ba4a5a454aa9300325f84a01269117/32874313433.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/xanijadonadurijubezi.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xowukinupodituluwekibiju.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/musawojonipuwimif.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/kaxelizazovakowusezejude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fing+apk+downloadPDF link annotation
    • 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_off0000cace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 10224 bytes
SHA-256: fbb13a039affb9f678b831afa8414bb72e4e581d9580d7c8c5e1e7eb5f58e851
font_01_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 18508 bytes
SHA-256: dde943ab736169313d23bea70df38255e8aa9068c0dab2ced6785a7228e490f8