Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81523bc3762272b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 16:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b032f5231af346d18e6ecf92ddfe848 SHA-1: 0a764665ab4b5bdae2324dc2cce889c41ee9c2ed SHA-256: d81523bc3762272bf07b3211b5bd691b95128f1191bc60c0192f77643457195c
176 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, indicating a link farm designed to redirect users. The presence of an IP literal in one of the URIs and the ML classifier's high confidence score further support malicious intent. ClamAV detection confirms this as a phishing-related trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://joyear.com/ckfinder/userfiles/files/siwow.pdf In PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82c60f04c---ferulofeditifanobo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/limev.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/91834653580.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/24195964026.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/golufes.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/85839194288.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b696f2a48---lebebabe.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/51493334368.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/51074189808.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/manoseku.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50866622798.pdfIn PDF document text
    • http://zubrcup.by/files/files/bedusasasuxawuruguwi.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/42709103671.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/60473160223.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/44008478793.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/3044673199.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5bc8be076532d88f280f27ca3616f611/24229475775.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210906_212605.pdfPDF link annotation
    • http://fireprovietnam.net/luutru/files/18492100837.pdfIn PDF document text
    • http://quinta.cl/upload/files/xixixenasedikotop.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/salalukixegebezibanegem.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/39140537443.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/61920357941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+iron+man+2+123PDF 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_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 18004 bytes
SHA-256: 23f86daa21611ab5572498472f720a6fdb9f4c950b4b41e49b2a89e253864ead
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10484 bytes
SHA-256: 700e2567423a3efd1824b51af1b20c762dd92072454ce88680487643ed0df86d
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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