Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4f72dce182f7d7…

MALICIOUS

PDF

136.3 KB Created: 2021-12-03 00:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-04
MD5: 0ed76d215d7e164a418d7c6324c4c879 SHA-1: 12717ff69a0ab0e4f7e8eba530d00c846b2fbdd1 SHA-256: de4f72dce182f7d7c02a65ab00add26f3732c7af4b8fef45a0725770200fde12
181 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and extracted URLs reveal a link farm strategy, with many links pointing to compromised WordPress sites and potentially disposable hosting. The heuristic 'PDF_PIRACY_STREAMING_LURE' suggests the document is designed to entice users with pirated content, a common social engineering tactic to encourage clicks on malicious links. The presence of multiple external URIs and the link farm structure strongly suggest the PDF is a delivery mechanism for further malicious activity, such as downloading a second-stage payload or leading to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

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.
  • PDF advertises pirated movie streaming/download medium PDF_PIRACY_STREAMING_LURE
    PDF rendered text advertises free full-movie streaming or download using piracy-brand names or a 'full movie + download/free/watch' intent phrase — recovered after folding the styled Unicode confusables the campaign uses to hide those keywords from plain-text detection. These are disposable SEO-spam carriers that route users to malvertising, fake-player, and scam pages; the PDF itself is inert.
  • 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://drafthe.ru/uplcv?utm_term=prueba+de+desgaste+de+los+angeles PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/22062428915.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/63516740725.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/70db73a757cd190ca260e25f24436a90/daxevap.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/vudixerikojofazibu.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/17993605766.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/lonusikakan.pdfIn PDF document text
    • http://vecsecity.info/editor_up/28151803627.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210909115557.pdfIn PDF document text
    • http://aleksandria.travelshops.pl/userfiles/file/kunovobudepus.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/8997446002.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/bobusesesozawukir.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/lesigalepowug.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fde4b4ea2529b62ca17071921d5aaf82/63802535467.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/lg2nikruqeihaa1hjkctrkh1u0/pijibugirodopuzuzejore.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16166d9ef2971c---18323571455.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/nowarixagorubifek.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/molur.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/60497036050.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/88518548753.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161663bd8a47ee---35561693779.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/tuzimelevisawisopipin.pdfIn PDF document text
    • https://refoca.cenacat.org/yiicms/ckfinder/userfiles/files/41371291763.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161655bd14edb7---fokoxizi.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 extracted file (font_00_sfnt_off0001b4df.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0001b4df.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4DF 18428 bytes
SHA-256: db8860e0e70705c401dccc4a5bd7eaa4056a8376aaf0f68623ac1288d31c4d34
font_01_sfnt_off0001e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3E7 10572 bytes
SHA-256: feda54f4374c1e75bf8f9f9210f4ec63f8dfcbedaa99eb659d9fb058810ce4f1
font_02_sfnt_off0001fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBF8 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336