Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49fc6690b4a1f8a…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 19:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67e711558c4e1f6eab6ca3129b9866ce SHA-1: 641e96c967ca126fed78b43d50a365476a102191 SHA-256: e49fc6690b4a1f8a12765f77c1c2100f63654a2fd33e789fc7271ac5d6a9adaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/68383790044.pdf In PDF document text
    • http://gibkrakow.pl/uploads/files/pijovidojefobeginax.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/kifaropex.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/29417056597.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/75932136875.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d509d8b5b2---41772106117.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gl4vh8522jisnc6cn8pghvqoos/52581871557.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3b7991aa---bebafirom.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/gikugodumibenidoviwen.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/3622011021.pdfIn PDF document text
    • https://businesslife.com/content/file/9697590474.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/92146776761.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/mukobamezube.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2e40a065---jubafususixarex.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/24540087305.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/28152798569.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a321913dc---55483466244.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfae6676ff---43307667558.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/pinafukupupufamelexol.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610877175eb6c---dekapusipi.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/fumepipapozazemisofen.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/nukapavijowiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=drishti+ias+world+history+notes+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_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 17880 bytes
SHA-256: b6836ffebbf2460dfe9b9d61be02b5b7091b6125cab0c3f1a01dcf71cce2a3dc
font_01_sfnt_off000136f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0C 10796 bytes
SHA-256: 63dee0da6fa48ea476891ad51abf5718015823f9a5708bb726a8ed907eb652bd

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