Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78e3109748a8cca…

MALICIOUS

PDF

106.0 KB Created: 2021-09-04 00:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af241f070de85426acb3263c320372ab SHA-1: 93d489108630014513806e1fd95258da540a0f6c SHA-256: c78e3109748a8cca97f54702c53053f615b8b523c485bb61aebb9aa1853aebbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to disguise malicious links. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=literatura+comparada+t%C3%A2nia+franco+carvalhal+pdf PDF link annotation
    • https://xn--pssa17sw71b.tw/upimages/files/52455158424.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c5679ed7---mitojaxifakox.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/wupanulefedamaxurixalinat.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/wepewekidipod.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/gijapotometamewikut.pdfIn PDF document text
    • http://masonhn.com/d/files/pozakasiwebowawem.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/27667297559.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/ravewad.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/jebaniseze.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc53f4c36c---51382539724.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/zirepaxirorusanaje.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/5096900908.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/57069959646.pdfIn PDF document text
    • https://steammining.com/userfiles/file/mumalidofu.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/42740787512.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/6379570360.pdfIn PDF document text
    • https://saam.vn/images/content/file/tatobutivekapopapixuxeki.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/mivojawiwirixite.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece094ec29---76061788052.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c663b2e646---52156574283.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/bajir.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0df44704a01f66db77d673e4c8168e21/7885150586.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/wojaxufevun.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/55138129020.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_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 23296 bytes
SHA-256: 74ba93488b278deb52c098f413dc868c4bad26145f9537be56d5fe37d7391fef
font_01_sfnt_off00016693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EAA 11028 bytes
SHA-256: 9cdf29290d813cec8fcabe4965f6ba91267736b3425f36655a5a6293d298a697

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