Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ff9c038556ddd2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 11:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0e871da769e194229f7a734e038c055 SHA-1: f9863ae62125fa98df49084b9d1872bbcddef047 SHA-256: 04ff9c038556ddd2be8442bb10edae5e692e342556835a8efe4b71acdfaa935a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous URLs were extracted, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or credential harvesting attempt. The presence of a link farm and the use of 'utm_term' parameters indicate an effort to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.prshots.com/ckfinder/userfiles/files/72249315782.pdf In PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/59123294308.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/nuxadesimimasevusomeseg.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/mowowa.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/51583353116.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5e93c932f57389a1ea44a44dc4f0b9a6/xadipegulas.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/62425938880.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161301105a68d0---10787357819.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/disepogutemamegizugukifij.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/76375528042.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/19060799082.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906093435.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/madaxuxibokemivelo.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/52379859282.pdfIn PDF document text
    • https://vestol.bg/files/file/61492331294.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210904100759.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/89039141154.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/bevujilerilo.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/91679332027.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/taladasiwukujuwurir.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca55bc712---kesuwokibamovug.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/25989548716.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/notesalitojedovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=w3schools+javascript+pdf+downloadPDF 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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 11032 bytes
SHA-256: 17588586355bacf4bf5e73ed36541d14a29650837a7c6a54966d37cdacbb71eb
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 17248 bytes
SHA-256: c3987b33e906a5e42c4bb773e203fd03ba2a8e1e0b41a048103938f5a6b8c1c3