Malicious PDF — malware analysis report

Static analysis result for SHA-256 3463b19e37e875ac…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 06:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 78b6c2010fa98753b05d97025757e4f5 SHA-1: e0fd930bfb2614ef1014d95d602f1faad7f2a5f5 SHA-256: 3463b19e37e875acdc46a41e0b2c029bc00c185337223b61557ea70775788036
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, but the presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1b612faca---56214095261.pdf In PDF document text
    • https://pui-vital.ro/msg_media/file/60393677459.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/48264910409.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/vezumavoriwe.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/96769573422.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/74370073421.pdfIn PDF document text
    • http://okvin.org/userfiles/file/48229188012.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/49530111061.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16159a007211dd---pemupolalitatazutabiwetok.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210910190536.pdfIn PDF document text
    • https://carlojans.com/cms/file/jasogilediniwipegudopi.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/xaxenefemidezotimav.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9ce8366b5---jixirawikaliv.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/27141704650.pdfIn PDF document text
    • https://ebooksweb.net/files/file/bumafawamosawifeji.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/64767044923.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6c5865f3---xopalidaku.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/denubunonopomaxenuwubade.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/sojorebibejo.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/7522280212.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/nowazilezuw.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/84195826182.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/kojafaxipunawonapitibupas.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/kubipitularaze.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/jusokurosebunavidike.pdfIn PDF document text
    • http://allycatering.com/userfiles/moxes.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/9801357602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=different+types+of+distracted+drivingPDF 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_off0000b69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 10932 bytes
SHA-256: 3d1394938e7462e39a05b3c8896485ed48e013632c491006a8705473b94cf45c
font_02_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 14480 bytes
SHA-256: 156f0042aa6eca1ff7bae9e6f0b65180a707e20d49f0e9e075efc8eb6af61323

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