Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7fc76f04fc8000…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 19:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e537109570fb60ef6e528396ddf395a SHA-1: 6de03e1c0552ab39eba3b04a5b941331577d9381 SHA-256: ef7fc76f04fc800054a9bcc2311cf347504b36f192aab59b769b3979f22f0aff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=how+to+call+forward+android PDF link annotation
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/69864048583.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gopafekilewale.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/dinefitita.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/npfcrsr7hk5lu16r28nth2jda2/muwer.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/56798980791.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/lewatokakubofajopidomij.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/43458409905.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/78710901920.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/gubofavasijafi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/gamomur.pdfIn PDF document text
    • https://energooptima.hu/upload/File/40553448587.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/waxavenefof.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zusiluvutofomo.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/82717355704.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/sigogej.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/84718553546.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/49590947943.pdfIn PDF document text
    • https://hinaweb.com/upload/file/34045851962.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/368ae54e20d17c94e101af15b440c0ad/tarabimubu.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/pitozimosov.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/2225435478.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/55137272581.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/82179978901.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/njf0dh98jh8c82cr7bfoh1ll70/28756135946.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/3072833133.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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 10248 bytes
SHA-256: b5eef9529df02569168cc5cd7d915ffc40ebdcdaf19c9e6bade9cc50059b1c8a
font_01_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 17308 bytes
SHA-256: a526f481ebddf0aa8344b9f2ac6ee9d550c0f632661138a7c7eae23e79781e32
font_02_sfnt_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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