Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de133124c16e9ac…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 03:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b9d3b4417ba1754e3dd6648d16968eb SHA-1: 6687c5af03bd59e623517c4b71a5a0ff87df4889 SHA-256: 9de133124c16e9accae4a71843e0530264a1ac73122b835df0b13df8e0ec1dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://salondumariagededijon.com/userfiles/file/12835703214.pdf In PDF document text
    • https://rotitelor.com/contents/files/19638196745.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/74542498833.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/favezagakez.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/saxini.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/61541573463.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/muluvotamuwikofe.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/tegeku.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/02bf4d6569e53239213cb138d4e74587/selaz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1277288316532f9416d161c5fee797cc/1182896128.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/pijajalevebipezazedukim.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/13036949665.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nadusoxuzoxogip.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1ab6d15526d228ef9e1ee156af1dce90/vafegoziw.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/93585072320.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14701ae67---xirokazagixelatopusezobas.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/62454875369.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kanekegejixanaw.pdfIn PDF document text
    • http://suaups.net/userfiles/file/duvanubabiruvidebik.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/wajeb.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/94415669685.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/sawuliwuxujubisenufanap.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///rijokufu.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/53225068801.pdfIn PDF document text
    • https://vientangluc.com/upload/files/pexitefuzorunizerebodoxa.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/76058082428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=2048+game+download+apkPDF 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_off0000c1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 10884 bytes
SHA-256: 9146e317d469379baa9113d41a7d16827760dada2f55c6085067561556c3f088
font_02_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 17436 bytes
SHA-256: 357cc13a97c09262018db493dc4d0e88ddd7c7e178d023f2dc7f7b1bd401b564