Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a123a735105d88…

MALICIOUS

PDF

73.0 KB Created: 2021-09-29 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcfcee5f383109dd8d028a58026787af SHA-1: c906c19fe81042afabae571dc30c2e73cfb1ad53 SHA-256: e3a123a735105d88a275e84a6f9cd1e861d1a19000b00c4769c4aae31c57ab7b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=hallelujah+amen+nathaniel+bassey PDF link annotation
    • https://jin-ji.com/upload/files/vabexafugafibok.pdfIn PDF document text
    • http://kunbot.com/upload/files/tejexafix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b971819088---15479552136.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/bulidafaziwavuralige.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/bogejeli.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5133b8b11---runadebedek.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/34840672935.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/duwoxonowixavipagipujiji.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/13293139705.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/64ce64062262e7b435fce30449609c77/91821989516.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/vasaririmuborikelevogop.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/22011172.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/11439917953.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mekojukekaxid.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/83007716557.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/rerafo.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/zaxekis.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/86110514367.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/87206333169.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b3bb495ca9c3e607428dad99d8b0977f/lezena.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/93703791503.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/nasufijiwebawu.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/ribego.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/37647878303.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/xusudamoworogosewiril.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_off0000b7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF6 17616 bytes
SHA-256: 06e7a9dfcad294ba64e879c856669422d9514cdcd9f6a0948f44e921efb26999
font_02_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10628 bytes
SHA-256: fbcf1d42258ab26c3d78da962c943764befbbfde4e41cdb9fa3cc36e6603ff35

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