Malicious PDF — malware analysis report

Static analysis result for SHA-256 f636abf3f38142f9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 13:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc3f996afdfc2a916c821034e117f151 SHA-1: 79f63ddadf295d6d173f547c8aa191d04a01fc8c SHA-256: f636abf3f38142f9ae08b68c071b208cc21a7a8547f18ce33fdfa6e8a5bccc15
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites or raw IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160759cddf122c---47088922236.pdf PDF link annotation
    • https://thisissati.com/userfiles/files/99820846739.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/q48ek7v96ofpg3hts3t4a9ppib/sijovina.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/75433446805.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/bamurizazogusuvu.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/57131431618.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/gufusasore.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/salipujimugi.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/30871484420.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/30361892218.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/tusatefaget.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/ratupomapozagowixunuseno.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/3cff7e146cbf80cca752e7d519b28256/46295160244.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/55355408670.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/milezodakibafisafol.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/nozasedabuteloku.pdfIn PDF document text
    • http://htwy.com/upload/file/73606864308.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098252a5c0cc---domenelegoto.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216184092577.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/42a3fa03015ff5ae03e9f984c26584f1/27694793153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vtct+level+3+nail+technology+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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 18184 bytes
SHA-256: 1ed6a64d3a1e5e7670eddcbc3d90a9a918cc3f35079246d13609309b1ebac230
font_02_sfnt_off000134a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A2 10952 bytes
SHA-256: 7253eba6f88a47855e8be00c4090e6bdb4e91a7aa710171ce97984545c6e7e43

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