Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d1ad1fc3a5e2dd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 04:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 852a562224ac6609ae75da2e8d817278 SHA-1: 38cdbc0f65997ab26960e44c55e75d19c5877471 SHA-256: 59d1ad1fc3a5e2dd2149ca75b25d6c34692bb79b23e84b50cbfd232448af5a39
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including one identified as compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1470c1046---xufixivininifemeruwinakax.pdf In PDF document text
    • http://abwbaltimore.com/uploads/files/94236071175.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/71341104335.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/13608794488.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/60838115764.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/wukifoz.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/47562000090.pdfIn PDF document text
    • http://boki.hu/editor_up/28205295350.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/33770286306.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/50397161781.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gafizakor.pdfIn PDF document text
    • http://mcutech.net/files/rogewuwixogizeni.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/29787114126.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/wunilalejozumakiz.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/5205299368.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131471fa1da1---47462231797.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/62289809340.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5cbr9if0iqidoira31c7l8pfhm/81749373602.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb0e99eee8---93420103385.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/samuweragugivabi.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/81179747866.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/samigalalirupalasikase.pdfIn PDF document text
    • http://landpas.pl/upload/file/24324178505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=el+silencio+habla+pdfPDF 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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 19812 bytes
SHA-256: 48e6f5eb31a678373cad4dbbe467ee8a023cca073663b6de82b2a4a3453338d8
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 10644 bytes
SHA-256: 9c8fa754bd17b6798166439364698e8bca6da6c29de585d749f67e375ad2c6d7
font_02_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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