Malicious PDF — malware analysis report

Static analysis result for SHA-256 65699c9e2e666646…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 12:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71d3edb10271fc642c417bd40ddf432d SHA-1: d94ca0a5c6b3a4dec867831d342b12d091036f57 SHA-256: 65699c9e2e666646a45e4a7cb05bf58c4ae3b4a7b9d3f4eca30838d00e91c7dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were extracted, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=box+vpn+apk PDF link annotation
    • https://coil.hk/upload/files/19441116098.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316fb86b8d9---82785995633.pdfIn PDF document text
    • https://mmtours.si/uploads/48677696911.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/34264535454.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/25807760393.pdfIn PDF document text
    • http://fxlcd.com/upload/file/14431997470.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112a5bf831---kapufezab.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/41045894455.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/bifaxisiletejinisevufi.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/76564777645.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/20700535724.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/20524736913.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/24410351868.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/67753175459.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161496db53fcff---9563318915.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/33393777905.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/josofukazupofew.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vifigafile.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gabakor.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/89015389926.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/91563272261.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210922154200.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d88ec2df3---litobufagajonotawuvepol.pdfIn PDF document text
    • https://pecsikult.hu/files/file/vinuteje.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/lanaru.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/vimejakumewalupukufamiwi.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_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 9924 bytes
SHA-256: 31688f325ac21d9c9bd8fc053dbcbc7275289ce576c4379c5576ff1a179e7f13
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 17840 bytes
SHA-256: 85987fb8fdd93d6d674c174c902bc67ff46b98c4209d59840bf0a28a059e1c17
font_02_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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