Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dab4426ba56d762…

MALICIOUS

PDF

101.0 KB Created: 2021-09-01 19:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df35907ce5f0ba6c4d474b04e9674775 SHA-1: f108cf651bb7f8b74268a2437253ef9efcd92a8d SHA-256: 9dab4426ba56d7629e8e72b0f4508d97d00a2ddae100daf3c56e5ba107a84f5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host further PDF files. This structure strongly suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6641538de3386cb0f54f7f0f013fac0d/ramimisapisivokim.pdf In PDF document text
    • https://airshow-bg.com/file/gozezex.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/roweresedugapu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/70109363310.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3508ce78f2---tebufotazuwavediriget.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/golunosusedajegonufivigo.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60dc9050d---vupuwojubufukepo.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/35554484765.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/69487650866.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/87575494327.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ffdcnblm9ene2vuacdp14qqhhi/zivolifogivedewefik.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/59335329915.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa923d05f1---64792419280.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bfe82b84784e18035edb66b6965c52e4/63801334635.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/rokudegesuvubijabepivi.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/newemiruvolekejur.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fe115c2b8dce960777062a6660b4d842/tidunizonivenir.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/62i2fdddk50ao0pf3c6oe7r8c9/sebomomezapovezovija.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/xidaresinitis.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/zakoxufom.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/255b28576383ccc8891b56191b735b54/ripobapakubatek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=whomsoever+meaning+in+tamilPDF 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_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 22896 bytes
SHA-256: 48b2f37866d62cdc41fdc530a533a0413d92c63a3b37d34faa038eff89925ca9
font_02_sfnt_off00016f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4E 10616 bytes
SHA-256: acc4ddc7cb7781911776ca11cc5d11f10e53d33731ca35ae5d89b21155accc64