Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0a12bd8f56f6c3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 06:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6bd77d1e3f960d6ffa686d4268793eb7 SHA-1: 48e8003baeeeeef474eab33821cb2c44cdfb5fee SHA-256: 4a0a12bd8f56f6c3f6318f404ac89fb799206190128034552580e54291ab2020
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://toyotaprius-custom.com/js/upload/files/38725670103.pdf In PDF document text
    • http://studioiulianella.it/userfiles/files/welurutakarimilafet.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/wubamuzivipegumipamenuv.pdfIn PDF document text
    • http://pk.mo/userfiles/file/fujumomuwegezolo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ibocdicjq21qrnfeaugecsn67c/kemikali.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/37438279900.pdfIn PDF document text
    • http://kaies.net/upfiles/file/16154500636.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613234f623ab3---59766811398.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/gilisojipesirutowebowuto.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/fowupozinukotatosinos.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/29112837312.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/puxemelitopawamimonug.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kewawutofusepopafesewonan.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/wigirazalesugeda.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc9ba0add---69484815362.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210919070337.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/49052383222.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/biwezalunu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/02cb36ee3c4549db7f4beb11c99b524d/bevajorawasubuxozuvejepu.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/39900164168.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/81724948271.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/20221485857.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8ce96523---detutosaxeraz.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/26047203133.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/65258533783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=delete+xbox+live+accountPDF 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_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10364 bytes
SHA-256: 9e67a01c982aab0916226af017bdc69915f20c15a6bec986bad006e3576d194c
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 18512 bytes
SHA-256: ad63a5bc902df3efe2248986848da6c3f3ce14049de86c9e49ec70bf534b74ee
font_02_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1