Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d9b16f27f772ba…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 00:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 46d653c73cadda37f649b7df1e66d6d1 SHA-1: 747723fe6e0561e3a2994044b516e2888cdb69df SHA-256: 09d9b16f27f772ba62946fd678c4e0510e0c68dfc2c0d6fadc0e6e2c2761df45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, including WordPress sites using the formcraft plugin, which is indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the presence of numerous external links and the overall structure point towards a phishing lure designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://planetamama.ru/files/file/novodutiz.pdf In PDF document text
    • http://hollywoodterrace.org/clients/863344/File/22974201571.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f44e6022---nisurifuvemapu.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/morovoru.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/mazomulovaw.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe9d34d25---26919315334.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ac2b1c1c---sutodek.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2052331023.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12184c5242---bemekatavej.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/9t5a6t569f1lqh87sqk534l6u2/56019402273.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/96909017538.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef6d33122---sumuriwosesawurerelitunip.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210709_AD47916B29D491AE.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/58995364299.pdfIn PDF document text
    • https://limsurdua.com/contents//files/lofafizesuvuguzez.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/35321438447.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/44903145323.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/15626013625.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/bejofiwubebufebabejibi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/93590168287.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/1838714027.pdfIn PDF document text
    • http://dothi.info/images/files/sovelalunepapi.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/8654a36a5eb333d3229f37c800a08e7d/kunasabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mega+sale+extra+2018+pdfPDF 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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 17944 bytes
SHA-256: 92ec5dea1ca07bcdca6eb55c2df624a90c2d624c7942cbeb406a177cc1e93b01
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10956 bytes
SHA-256: 7e6d9dfa8e3d3f6d68cd55b7b5c0e75d6262302d7c5dd4eaa822636bb9f75bf4
font_02_sfnt_off00011478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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