Malicious PDF — malware analysis report

Static analysis result for SHA-256 e515f26d41f7737a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 15:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e58c99940cc9ed694472436c03292d3 SHA-1: 74c0276239c6f5cca00a76134c7386e2b80680bb SHA-256: e515f26d41f7737a6de31a83ec5c72010a1b84b56b11a59c57d3b8be36ead71f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://zenmobile.in/jaipriyart/uploads/files/bugexujibod.pdf In PDF document text
    • http://byty-pardubice.eu/UserFiles/File/lirorojurukunexageza.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/87496030503.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/89251428868.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/13235637433.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/68591959592.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/83870387387.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/30583521134.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/gukajefesajonotoda.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/togiwiwisopudilazov.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/81212781903.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/pegumamolizu.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/16423494545.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/99ba0fc63f0f9037b6758562c2946b05/vajiw.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109121126333624.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140920677d9b---modovufox.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec84e838c4---68255356815.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/nogerefulabawi.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/natelozumesos.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/miwewokem.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5594af8a0cd79f6eb098f071f816297/silejofiburiwasexufupipab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+force+close+app+on+firestickPDF 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_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 10640 bytes
SHA-256: 686195c113b28b70575204481a6a623211116bca4bc4ab3f46a841d213e540e6
font_02_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 18968 bytes
SHA-256: ed266becfa74133392d550c31838ec9ce5618e5234aeeaad489db3328f886e93