Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cbf2f4d556cb7a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 04:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17fe406b6449efe4f338e82319090aa1 SHA-1: ca60973a44df6f342b11fba50d1edb1a2e8ffbe9 SHA-256: a8cbf2f4d556cb7a4669bc2c7b9d6bc7ecc84d81d463fff01e75417a9b5e145c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities to download and execute malicious content. The presence of numerous links to compromised WordPress sites and disposable hosting suggests an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage payload.

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 http://lesen-und-schenken.de/userfiles/files/sugimetekiloluriwed.pdf In PDF document text
    • http://vivatbacchus.hu/files/file/24980923128.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/sotazofuba.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/muboxazomisatakulovuk.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/fulasatunire.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ec43bbf4---logejemagubifa.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7b618f08b633db6b72e1d9d0ea349f63/kugoret.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/jinifapofufivoj.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/uf16765b8pka1hmsah8fjsoldk/76940072177.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhp1vo7a2enouruggrb773omc7/bavovuleredo.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/ludenekixopolorafetadome.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e52434b2235---xomul.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d7e440876---jujifogasorenonebinex.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/lezanebujij.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5142f9ad---zevogoxubububumaza.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7e7205a87af42e39cb02bcaecfaadfac/20273790534.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/vofazuwupi.pdfIn PDF document text
    • http://pjteam.hu/uploads/buxajozazon.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b187eaf9d---suxuviza.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/63930395265.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/liwafipipowum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=il+cantico+di+frate+sole+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808c62ce71a---lofiti.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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 17808 bytes
SHA-256: 4c7630d8bd42ff8712524fc9373c55fb384943ca7223111a50d6a4746a175b7b
font_01_sfnt_off000114d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 10564 bytes
SHA-256: 6a65428598a22f8f78c88828b5732aaef9a528072bd0dd4042ab06dbae0d5bf7

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