Malicious PDF — malware analysis report

Static analysis result for SHA-256 93eb6198cccd99fd…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 05:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63b238140ec361c0cd9c484aece798c3 SHA-1: fa33e3c66f888d380081e868c4217ea3018add80 SHA-256: 93eb6198cccd99fdf29e063735f5ff156215de2c0858dcf3e52814352a0b6245
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, many of which appear to be hosted on WordPress installations. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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://quinta.cl/upload/files/76285493295.pdf In PDF document text
    • http://sewakendragroup.com/userfiles/file/47708625823.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/36881013099.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c422af83ccd---40387430112.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a53c9045---wasadowixobu.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/5ev3i384of2lcc9ap5r16cvat0/nigapuzu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f5e1e634db070922dbe7d2c986a522ca/45148796892.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/56737021682.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37e571441---99395387061.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/74491304747.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/saruvipimulidifet.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e035114461b---93663924191.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/23970967360.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/56025233989.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/momalixazofomojoromafa.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/15372654692.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2238d5313f9a1f176eab8e82500a3f48/dupujefevepojabawut.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b419d06f45f---fuzidugezumujonije.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/7240215661.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/monojekebugure.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/93072163763.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/97159664983.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tedadogudevujupiwerekus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=antonyms+worksheets+3rd+gradePDF 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_off0000b9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B9 11004 bytes
SHA-256: 2dcd5d565f77d9c397239740d387fbf5cf7ceff05d6bfb61e48d6a48d3ac13c5
font_01_sfnt_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 15948 bytes
SHA-256: bb87d629b5f2a0587170fca0c9746158d60b33f08ef488b69da273cac9233512
font_02_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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