Malicious PDF — malware analysis report

Static analysis result for SHA-256 95024ae82d42e4c6…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 01:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76c04629907433007a1990467009c903 SHA-1: eb06913e17d083b25a40a8ea42e1f49481522f0d SHA-256: 95024ae82d42e4c6ff85aa7cb6e21a49395317159949aebb1b94c90a7276bdc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=clash+of+clans+hack+full PDF link annotation
    • http://abimobiliare.pl/pliki/File/37669854824.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613299d0c8105---50115630932.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/pigufatujaxon.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/tafakibusafodif.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/pigagopud.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/74881925943.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/mepewuturuziluxo.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210915_215431_135.pdfIn PDF document text
    • https://kristinanamaste.eu/files/bijepotanegipe.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614502076b959---bedodeduji.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/teferuwugosemaxinigasaxa.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/jamisekilivabu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0b64ed61---53402040937.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/suzivuxobigezenikoxafonap.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/37743262854.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/5905239519.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/norejipakemonak.pdfIn PDF document text
    • http://silver1979.com/upload/file/36335219124.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/49536884990.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zizurezo.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/77176470175.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/36823314095.pdfIn PDF document text
    • http://palami.by/images/file/xulolipuxuzevuxuboguv.pdfIn PDF document text
    • http://workontext.ru/media/file/tojipasopaxasik.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/49110613297.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10232 bytes
SHA-256: b10e5de28ea056d3432ead2506af98a0fb24b42bc41f8f506841b180aa870990
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 18484 bytes
SHA-256: a1ec1c1c63bae82bc03105cde4118858bf39a5b076c049093544ee9e4c5d0fa5

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