Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e189f8ef579102…

MALICIOUS

PDF

82.1 KB Created: 2021-08-23 13:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 94cf00019e47488fa8183e85bff8974c SHA-1: 0d7566e47520d0f44e6d14c363f0421432d0379e SHA-256: 11e189f8ef5791025cf120ff92bb2f4fbf66b5ff923dc61b37344469af2de5dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and a link farm points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=happy+new+year+2021+wishes+gif+download PDF link annotation
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d203b2b6---29853333967.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/51157815245.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b2889e8488d---ludevegexetavilubomo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d6904f4e---fozutamusaduxewa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bfb733f1d---69241703486.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7786a51a---lasawefoxoramodogaka.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/94682980380.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a84bde01f---fuwojofokebopebu.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/61939428023.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/5f68a2cb06a06fe8fafb5bf40a6138bd/39142104016.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/jofuvigulilem.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932190deeb---11738754577.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f0c09143---65515022604.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a692a29265c---derelap.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/56165359376.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/gudojazoxegajugusubopox.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/549544d9db39eec723443606f68a83b6/wiruna.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/9091994786.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/tawuk.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/35623941189.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b2b8a187---36315397425.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 16664 bytes
SHA-256: a8d27d759988d95a4ecd0db5742ce915229433a4b9ee17329b3e5c0d58c867c7
font_02_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 11164 bytes
SHA-256: 45d7c649fe639d9455e53bc111236d10bef283ae48f53924b722b470951ccbf4

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