Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb74d7e5606ced1…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 02:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 443c9f6c703309000b890fc30e40106b SHA-1: bd521951d335e8196a647875c0fcedcdc56bb1e8 SHA-256: deb74d7e5606ced1a7dbbea6c877140c1c94fd54f2a7e635f03377222f674410
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via a link farm. No specific malware family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://whitedwarf.ru/public/images/ckfinder/files/vuleg.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4e463c339---17236305432.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/nimugapewepujujuteno.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/aa2042b20d65635f58b22b1f96d599d6/73435840580.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/23547283362.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/182a469e455da13992de2282ee5f1b6b/33006698062.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/63407523791.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/47088181801.pdfIn PDF document text
    • http://yibetter.com/data/files/84291379692.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/pukasaduvetipegap.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/64809674707.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4234515257f0bff252ad2a8d0ccd7111/kigonuvabadajo.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/jezejuxewud.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16124dc2be26b6---78919520634.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7cdc1b85---rozoruwur.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/dc87e03966ac65815a7fe23dd10d0a0f/69118611430.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a569010b4---bomabiwemalovunuwabawepek.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/32520407521.pdfIn PDF document text
    • http://knipia.com/userfiles/file/76422655696.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bq2v71vrirp4ullleo6msd626c/bigoze.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/22960615521.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/23052199991.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/pezuponomubalutijajosiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=one+thousand+tonsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_02_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10232 bytes
SHA-256: 15be85b2c4f539f7034eabf3f5185ac588110fe43ad0abafd8f3ae0347a92035
font_03_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 17772 bytes
SHA-256: 2568cb1e0151690502111a5960dcb61ef5a72f428ef973e6c23743f874623749

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