Malicious PDF — malware analysis report

Static analysis result for SHA-256 332d12b30466713b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 16:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e101634195469cb099abff8cf2802444 SHA-1: 06f4d19ee974e10f0b6848b7b84f4062cc6a15b5 SHA-256: 332d12b30466713b5cc57c23492a862cae5404df6ac61288abf396a3864297f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://chcial.ru/uplcv?utm_term=microbiology+wessner+2nd+edition+pdf+free PDF link annotation
    • https://winpoasia.com/ckfinder/userfiles/files/mubarejigunepusave.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f8a883b6ea8cc7362efe391d27022b4f/6724001144.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/kudetesejivulivofivotu.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/jutikikiruxadibedenedube.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/87676196969.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/65667813825.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/21096258529.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/peken.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/vopesepiboguna.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f81db9dbe---sidonoxapi.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/zebidamox.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec944f14dc---85071943364.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f024e5a3---75714260071.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/2329661813.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/711b8a6a9c4bda684248055d709e913b/pebak.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/losisuxo.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/vapajiwiwupapogetanuvonex.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/sabelalevukodutarus.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jefupaperiditikoviro.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kugiza.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/kowejojuroxilaxaretaf.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/zaxodofo.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/66133953747.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_off0000cc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC17 17640 bytes
SHA-256: 169d1c2ebe375ff06c4efcb080727988fc5aac632019e50bcf48d2b273697286
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 11088 bytes
SHA-256: b8c5754a09c722f8c283ae45346f2aeb5b125b4ae6ab8ba5c949c7e1454c750c

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