Malicious PDF — malware analysis report

Static analysis result for SHA-256 74521aba4b2f0e8e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 22:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a4ff839b120048dc1779a4b18381726 SHA-1: db6d0bae93b6bb18984a0208cdfdda3c94014159 SHA-256: 74521aba4b2f0e8e10b7636be692f431ec39e76b3a51d8d791b327c8f1760a35
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and employs a remote-support tool lure, instructing the user to install or connect with such software. The document contains numerous links to external sites, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting an attempt to redirect users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://queure.ru/uplcv?utm_term=live+football+software+for+pc PDF link annotation
    • http://skrabl.pl/www/rpbd/fck/file/senuradejomuzesevasi.pdfIn PDF document text
    • https://viettrungson.com/media/Files/68707608359.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/febuxu.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/29701826450.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/qecv63ijuftpmkj97be8irgcrv/78854534601.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10586954715.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/55747878150.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/gatibobijatu.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/37107308815.pdfIn PDF document text
    • http://sooclose.eu/upload/File/susojijugunos.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/lerem.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132221d1cdd8---45732031179.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xirefiwebiwetolita.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/rafotilijenudewila.pdfIn PDF document text
    • https://duel.pl/userfiles/file/jikubamomokakamo.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/genekezusud.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/71495079688.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/18683617853.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/31373270119.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/dopaduzuzitekadudiwujite.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebe9f22ca---korojabijofaj.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d8de487a2---42559928850.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/xupaj.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/fidunavijatotutoma.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/10089004315.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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16960 bytes
SHA-256: 2633d8aca1278924c32ec239e32c56c49332cf8f2af861c08e5c955ac8d248e2
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 10616 bytes
SHA-256: 09dd1d34498164c264102ee26149a9cbcf332256a45015e1e207ac4277b913c5
font_02_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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