Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae07c4dc0446a92…

MALICIOUS

PDF

143.2 KB Created: 2021-06-27 02:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0044feebfa06623347a70e7b13dd8f2 SHA-1: 52e8235929b263b2a498e7ab14abd3a51e8959e1 SHA-256: cae07c4dc0446a927649a588c145d5f7deb3a7654ae54e435cfa71dfb335583f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to obfuscate malicious activity or redirect users. Heuristics indicate the PDF acts as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a107c6b3479---guzamexufelatiwetexus.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ace1a55cd48370d26e92abfa86512063/87915183022.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8e7b732b---56640927497.pdfIn PDF document text
    • https://chp-travel.ir/data/file/nunebolegenaxolafusep.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/megakavemuzisem.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/96374474439.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd93d5ae7f---14808805531.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be35a583539---70346824967.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c876afd82a35fa4a616a308ebf1426b7/91908956083.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9f84e27c---61197508325.pdfIn PDF document text
    • http://snsi.jp/image/news_file/70629269152.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5c401af3413d3e7d28c775921056b8a6/guritetiri.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2bjsrad5st56svoc2rb32286pa/83270865479.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/teposet.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e8e96417---54509024257.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2cadd3097---nafawu.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/lobulanoxoweriw.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9311b4dd9---88536618846.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/bomegawedekekiw.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078eaaf3b4e3---rugujetibulukexixefuvemix.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/tedabogopezesosipelazojom.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/ferigidu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8a5319d593d28961eee1606108a7db5b/gijanalujosapo.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/medopagivexodumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wow+classic+all+dungeon+questsPDF 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_off0001cf09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF09 17420 bytes
SHA-256: da445744a118f3bf12e33d2384519539dd8d6e7c92cdf527b02a69a69eb02e6e
font_01_sfnt_off0001fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCB5 10768 bytes
SHA-256: d274e6d410d85933fe26f07749caf90a9bf6ef7bf66a2ca88de9db876fd8259b
font_02_sfnt_off00021529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1