Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9fa437f779ac0c…

MALICIOUS

PDF

92.7 KB Created: 2021-09-17 03:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75f3eb4a9f3d339b447127d7a1ba8425 SHA-1: ff278c6cd6c2004cfc6461dbe6554b23549a129d SHA-256: 2d9fa437f779ac0cf2c740a3681962db11c160bd140b5afd2f72d2dfb5c5b41c
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The file also includes numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crewmak.ru/uplcv?utm_term=bollywood+movies+2021+online PDF link annotation
    • http://baocaosudanang24h.com/uploads/image/files/96524022445.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/53828460989.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109160549108318.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/mudivulakuroxijafazowu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/64076777096.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7a31eebb1f35f2a1d7fc8bef656f1263/jigawutakiterit.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/87848897721.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210904092731.pdfIn PDF document text
    • http://stisk.com/file/35896455459.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/90993601577.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/fusaminizukekixulosix.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/zebugulofugusulinikel.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/tisezozubozetutimex.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e42489019c5d25f114cee3369265c455/zunafanukujoli.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/26313734002.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/94577705838.pdfIn PDF document text
    • http://sissonne.hu/editor_up/13739707330.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139842c631ad---zaxaraze.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/44257424375.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/gopobubudul.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/lojojesatuf.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/75090263987.pdfIn PDF document text
    • http://ellev.fr/upload/files/tiradopavedazorawipoxox.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_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 10660 bytes
SHA-256: 52cf7242d02efb7094a069107a2c1fef29b424c43227f78eff65c32a04e80b29
font_01_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 19140 bytes
SHA-256: 6f1e6a80c637cc46db7a0eecfd8fbaa764051fb665b2b96bbbd48eb0539dcb64
font_02_sfnt_off00014cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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