Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c4611136370251…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 01:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdad3ee47cbd25380a17d23632ea26d9 SHA-1: eda55232447eba124edaba7d7a20f4b2ef22fa76 SHA-256: c5c461113637025120c6964f3742765f2c0d8a02cba9d076b69cf3ddea23cc29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to various URLs, some hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be redirecting users to external, potentially harmful content, rather than delivering a direct payload from within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bilafafafa.com/shopadmin/upload/files/4255767042.pdf In PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/mukedoxobol.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aa06d069---xagigiwaxetimi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/nutaso.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/56555797428.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ladikagefofobogugikeduka.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/15476910206.pdfIn PDF document text
    • https://campermagazine.tv/public/file/pilufeg.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210908_221614.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/11733188234.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/pazujivexusokawowegusu.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/23215499226.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/rumuwema.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/jimodanamugolugegab.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e7f4d3a7---22326457608.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/93932958489.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/88623499272.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/31656148442.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/89115830427.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/64342292591.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/mizawe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eca555141---59647302417.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/tegakezoronutavuzenewo.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/37004558734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+green+inferno+full+movie+online+freePDF 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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 10360 bytes
SHA-256: 9f71a4b759c1b07c3c1fcedb36d98ebf09d4918d7fc81fdf7fe10d793315a23a
font_01_sfnt_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 14504 bytes
SHA-256: 1d2ea6098ffc89ff1158165e4190f942540e21583962bd886242f5d4909c46a2
font_02_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1