Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68c69561eb14306…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 05:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c4ec06b4022b8468c41e97a351377002 SHA-1: fb2ab45cfc5aa33d4790f54927bf59d284e74546 SHA-256: d68c69561eb143068703e739e08b9aeb13a8012798fd5eed33067fdb9b731bb7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://plasy.com/uploads/file/vulorag.pdf In PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/nisesexuvejejofebonejo.pdfIn PDF document text
    • http://zenkatsu.dk/files/saxenipuvirij.pdfIn PDF document text
    • https://ever-progress.com/upload/files/wewelonebijuvodesem.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/rasixunegunapazaleke.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614407a65f4f8---kamipuvuvobagovawupuzupuf.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613f76b9029f0.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/pejowulonemisozofik.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/62397816149.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/62943353163.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/xunanalazizivokexigukamo.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xixajovu.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021911316447484.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/87960663072.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/23529505078.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149422b9f9fb---futirepoduwurefofunama.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/89309646347.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a9020f3ab---niwodiwe.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/42272543632.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/99456654492.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145668daaa39---39028042096.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/tenexomikidapojaravaki.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/74945615311.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/68724433978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+attach+documents+in+messengerPDF 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_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 17692 bytes
SHA-256: ad6d09b9274427ef199d219b9e6be2dd8be220bc913b7d3a24acd95a9266db3e
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 10948 bytes
SHA-256: e7fc219ae686c22c87361a269067be17707752c87d8a8daf6aa46288e7146e9b

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