Malicious PDF — malware analysis report

Static analysis result for SHA-256 3572b16208d9b007…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 15:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73321cd4d35b09897726da87200c9f91 SHA-1: fe62c27a2dc86e30b64c4ac9fae1d74b844d91d2 SHA-256: 3572b16208d9b00707ae62d2dddff449591d7d60e5749b7833c17a9e3f8f03da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a second-stage payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f512442700---vetepidaworuviwatakum.pdf In PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/kipugotuso.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/78266345456.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/29c36f5e3f031cefe6ebf119bed72daa/konazududokojegixuvikupol.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/xidegopub.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/93343352811.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/betozigijowok.pdfIn PDF document text
    • https://la-klamm.org/Files/files/zojanebowenuwujijop.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/zosaxumofuneluwozi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/47279728690.pdfIn PDF document text
    • https://ibextrail.com/editor-images/32746683455.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/97719282033.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140e490abfa8---fagixupa.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/resoxatolunikofap.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q0jm56dlv4dg8r0tusemd8mbpm/34079907732.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/74631931738.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/88904882976.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/707469549.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/11618849741.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/soxabasoduveg.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/25256448286.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/69157157462.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/wasanusogojupino.pdfIn PDF document text
    • https://theipbuzz.com/images/file/24035442231.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/14618109961e8c7abbc1b1bd007f9d31/fikeviwemefumirobuvajoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=one+india+chat+roomsPDF 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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 18448 bytes
SHA-256: f900dca39eedfa61c8ef2ef79cdb6d8cc2a89f363223501648f52581c5b803b4
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 10612 bytes
SHA-256: bf7231b10f2bc6176e6bd52fcc553180efea6e533771cd830f239c9161a7345f

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