Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0ad77fe8807d96…

MALICIOUS

PDF

85.2 KB Created: 2021-08-16 21:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa392fef0adbc8d91b719ce41ae70122 SHA-1: 66376b9abd42866b023a72711d45310bacf454b9 SHA-256: 4c0ad77fe8807d961123b4d0da3cdf9b8ba195e397fda17aede6f1b55f80513f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://cmoretv.com/userfiles/17394953279.pdf In PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/vekebefadilog.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/44d72eee19782db6720f974e9e54ae16/28851610499.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608be4da21981---lonuvowix.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/binizibafogeremijetosi.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/4789696242.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/smh8nivek5k177hh4kfftv2ef0/sitolorimir.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/fexunaniritawinomapon.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc1298434---36713264404.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zejexuwosijukakarobo.pdfIn PDF document text
    • http://julianina.de/upload/file/55639085614.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/35254358571.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/70b0ae9333715b08339273658149997a/58490003502.pdfIn PDF document text
    • https://sinarwaja.com/account/files/zalok.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/jowupivisug.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/53257638441.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9a4fef362---38643187442.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/85746380654.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/pugumanidezup.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2477679b3---lugotelenakom.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/68702799704.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/gukud.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b41fa288cf06c63dcca1cc8e08244c28/48062922035.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2c8b16818be4e92328b26e7d9338341b/7022196423.pdfIn PDF document text
    • https://777mto.org/contents//files/tidebivipezodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=watch+dogs+2+apk+data+modPDF 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_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 19364 bytes
SHA-256: 78d8bde99f0b8668b5408f96f250f55c18e47d9391b1af2e103c7cbf9adb84da
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 10692 bytes
SHA-256: 7d101008515aa8d76dac37914175cddbb1be29b0c98c0b51bb4c6d18f5428fab

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