Malicious PDF — malware analysis report

Static analysis result for SHA-256 956744e333558f5b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 07:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b3244c510710fddbe6a7d6db07fed5c SHA-1: 3a5054797bcd8315b0f53450e3061264687cf4b4 SHA-256: 956744e333558f5b602a123df838448204f650bbaa565e341a07a61d59d2bbd0
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, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites for phishing or further exploitation.

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://crysiq.ru/uplcv?utm_term=android+fragment+animation+library PDF link annotation
    • http://cualuoiskydoor.com/webroot/img/files/37639188026.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfbf24a5da---48859253694.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/magejuzeneran.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/71309717598.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/nokav.pdfIn PDF document text
    • http://nanopena.cz/upload/file/29445308181.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c52257551b62815e0a4a72806fcee46c/82750250283.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/rumatedazutuzipu.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/foxalupusik.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/og7n8qjotcnu0qv579c210qjip/1169129013.pdfIn PDF document text
    • http://carbontuning.ru/file/guroviwupesuvo.pdfIn PDF document text
    • http://eichler-kammerer.de/45167990049.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/37bfdd6e5c514cd4c04d27b01c90441b/moxufukixirova.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/68265557006.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/62904058518.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613085195328b---meloxatinofaja.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417db6eefb2---67394969234.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/17196572833.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/4495316082.pdfIn PDF document text
    • https://ms01bet.com/contents/files/12834350210.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/lekokon.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/bolonoxidufu.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/savitimukasekukugid.pdfIn PDF document text
    • http://chongros.com/userData/board/file/19665711428.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_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10764 bytes
SHA-256: 2ec5b4641565a06131595f7cf06668061d00623bd18982855a6915dae42225f8
font_01_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 18004 bytes
SHA-256: 587b8b8d1e2d6ec50fcc219158b20d7c48d1b5863302cf3d643dead284ef2647
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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