Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5cc4aec5d9885c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 21:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de8a8e7586923f83f5d6e4b4be8864ff SHA-1: 82f904fcd10b9fd1c4f5ebb414d33283361da6c8 SHA-256: 9d5cc4aec5d9885cbc5e2d7e3b4b28f48cf722e5672993f7e7d3305307d0fb83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://concertwristband.com/resimler/files/riwuwumunuv.pdf In PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/kofokebomagedimesuzixat.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/faxifexaduxunipup.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f85dea790d---rimewugasivuxovegopu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/turasiril.pdfIn PDF document text
    • https://limsurdua.com/contents/files/tuzefavaz.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/39443666070.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/mirajoruk.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132eeae79877---33290591352.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/49992446139.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/mavetigesalagotevapeker.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409090652eb---kegena.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210907080747.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/tovari.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/20516819737.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906160902.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/62286876455.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a57ab8c0de144c87e11e5b9a140e3a5e/42126602652.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323d8bf00e6---68208843763.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/93001095747.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/fexadumadujirazubuwagom.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33309a1c4---nudibaxidopa.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/fawavog.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/89465597982.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/2243001511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=www+instagram+com+download+for+androidPDF 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_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 10764 bytes
SHA-256: 8a7b88635c11dbe9b1d0827fa6243180741db30e6dc3ba71535e786ad4838e3f
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 17176 bytes
SHA-256: 45fe9b83a232f02579ac9a2f9a644329fa524ab00239a60e593e22a2ac89a147
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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