Malicious PDF — malware analysis report

Static analysis result for SHA-256 de482b3760e45d33…

MALICIOUS

PDF

80.5 KB Created: 2021-09-24 07:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9eec0b24e88a8b2deae1049bd273edf9 SHA-1: 655a2b1a107739e45f160ae2cf83a13c64f79f5e SHA-256: de482b3760e45d33480396eb660b7b96d2bf7af8bf5b03dd8ae6bdd3cd0b30cd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://elencostruzioni.it/userfiles/files/53606299484.pdf In PDF document text
    • http://tuanayapim.com/rsm/files/nipoj.pdfIn PDF document text
    • https://badoza.net/userfiles/file/447978333.pdfIn PDF document text
    • http://gewald.ru/content/Files/sulavagajetikegisugajuxu.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/24211240993.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/bagizumenuxo.pdfIn PDF document text
    • http://headrepublic.pl/images/files/64284425052.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/44674819546.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lejasazebas.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139241a70867---99988140212.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hf0l6i78mlf5sjjmq5cqvo3pu7/ruverowoleloruxufu.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/mimov.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/84628943102.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/25cb71da7f91dae1024fbf74c918637d/rosazodapepozafevubipevat.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/55065132086.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/waziruretumugarifek.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/bitisabatirul.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/24334510432.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///pumowomusegikagin.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f0dd0aaa5b4cda6f63a4bd0351fb1339/gadinekarebipinoxaputa.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/jijimogekojuzozakekuzu.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/xepirexukasa.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kegobejan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=samsung+galaxy+s6+a+prueba+de+aguaPDF 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_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 11124 bytes
SHA-256: 7fa0818f21c670634ee7b7474bec54429b4bff4404f59d417434dcd64a54e401
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16864 bytes
SHA-256: c468ad61d2ca79a2f6a5aa8b3b4403cffec7c97de735954c1e553f73f0a6995d
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1