Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede4b62c49c3fc03…

MALICIOUS

PDF

101.1 KB Created: 2021-08-25 11:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d936652837f6fc74e45e89b00e826b9a SHA-1: fdf2dedda6693e04bfe2afb201c788788955d933 SHA-256: ede4b62c49c3fc033882a3194d70cec6db6d2c7b8991b24f05300c13b4093da8
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness, classifying this PDF as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites, likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://ibeguiristain.com/userfiles/files/67902329172.pdf In PDF document text
    • http://shinex-auto.com/userfiles/file/96475918982.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/58666985050.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e0d995b7cceaece4c2ad39d90246cbe2/94890175612.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b4f56e41b---jisubuvitokofimikumepu.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202108161241346010.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/27884255042.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/rurigodujutusasewira.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/44821767313.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f7c45ab37---vimozix.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/memewer.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xunuvugowiwumu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5543c23c---fewopoxugiwud.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4977a764dbf9010b14baa4de005df19f/dakegorej.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/86082321453.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ac269aed---pozotakapijemusuxutufiton.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/55066253511.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/poledibokilunofim.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d4c8a9a2bc89c837f92a463463cf23d/nifozej.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16123cc0463d44---92237604728.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/46731040772.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/44894574882.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/wisomul.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8803700d706df6b35c01234b02de8e8d/37380055572.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094af246b782---karugidezomemidix.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-23/20210823180022142197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=use+manipulate+in+a+sentencePDF 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_off00012969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001417b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417B 17600 bytes
SHA-256: 1a8a76ffecd41573518f17e7fef7f8dd3828fd30889cf8cac866baefc26537ec
font_02_sfnt_off00016f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2A 10424 bytes
SHA-256: ac4d6724c77fa6cc147f40414d85fd1263f24246f0b448630b27799a063289ec

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