Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1e69b1ba66ba63…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 03:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91d20b8d6e818fe743227edab26b53bd SHA-1: 39232375e98850a35daa17957f6f4682bea3b262 SHA-256: 5e1e69b1ba66ba6359b625cf078723924fad4e24b912892debac5b812f77f1e7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and a significant number of URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of further payloads via the embedded JavaScript or the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=bus+simulator+ultimate+pc+apk PDF link annotation
    • http://manilag.com/FileData/ckfinder/files/20210904_F704098955DB50CD.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/30224867667.pdfIn PDF document text
    • https://castel.ro/userfiles/file/99752513059.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f04be0c0a3---liwalag.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/fonolitutalenexolo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ac1464c27---51996670077.pdfIn PDF document text
    • https://rotitelor.com/contents/files/dadozaxokevitibevinobax.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/8428079169.pdfIn PDF document text
    • http://0048.pl/48files/file/jarofen.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/ludazazomukefoxotulexi.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/17514502807.pdfIn PDF document text
    • https://securitydm.com/slicice/file/vewezugokorujovabe.pdfIn PDF document text
    • http://jfe.hk/userfiles/33955098621.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6a2b37194f63b7ff0176b6eadeb79a80/14423245119.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905c4b2b9a---63041862585.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/41480380516.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/99605886996.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/26102739467.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/79102860172.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/34429695832.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/83040857377.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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 10676 bytes
SHA-256: 3c5f305ff4531a8f06fcfdc7005e464bbe5b3001b1023ab670e83c1090f10dee
font_01_sfnt_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 18148 bytes
SHA-256: 47bf642adaec98ad88e8aa2f5a5d25b2bc9ac8ffde19b6e061536ef0c1e7c248
font_02_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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