Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e520379de951d29…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 10:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a6ebe3c528e5502f0eff476869f2a98 SHA-1: a8bce919cff8e7b576801c6eb27335b465985910 SHA-256: 1e520379de951d29e5fbb63a215fb57121d1e9a2a02d48b26068a326810a31c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various PDF files hosted on multiple domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/89750636928.pdf In PDF document text
    • http://romengo.com/ckfinder/userfiles/files/rixuwagabogi.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/10958154795.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/gunufitasuxalogelalasojo.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/09fc701d9f929711f28511483959e931/97459331798.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/dc9f60874a90897bedfff43838cfc7f4/14464811058.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/gerefanutepuxawure.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/vadubu.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/robipirizagasoz.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobolijamo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/872336021.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/julojipolerurifekitat.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/53175908253.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/51694057475.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kepulenuzaj.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/15018068860.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/37919380467.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613044f4b77c7---23524539571.pdfIn PDF document text
    • http://mfcpavpos.ru/file/gixujumipo.pdfIn PDF document text
    • http://agavietnam.com/img/files/99538744769.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/21265251847.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/55745685792.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/74375097115.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/jawizid.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/degawi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613957373e9ed---15109140826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=clean+master+for+pc+windows+7+free+download+32+bitPDF 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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 16924 bytes
SHA-256: 848712cf8791e1b0f7cffa7fc624659773784c54d6b66dc03a5ebf0f7945f424
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 11380 bytes
SHA-256: 1eea76fdc2253d43dc4d715f587dc68a064b2ef6236c0a7d9d3914c7b21b9d32

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