Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cbecc28b136d44…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 07:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75a1efb9e53e4621ae798aad60a59c3a SHA-1: 101b25d4f0884c526bd698fde51f0b045d1fcecf SHA-256: d7cbecc28b136d44504d050a3a902ccf7fac69bbe6c4553cc752d8a1a150364d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to download and execute further payloads. The document also features a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded JavaScript indicates a likely intent to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://affordans.com/ckfinder/userfiles/files/78670671041.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259244db4---92121946672.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/wedotelumufuwexitewomi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161365760a5a3a---bugizubufiwofoturos.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/006f6041adcc6762969b38baa42edf22/86452575960.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujuvorego.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210909062347027.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/78072943999.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2aee8fc5b---rifibajewomoj.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68b2c05c4---58145073337.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f9ec153cc2ba341ab498234334670225/22584227465.pdfIn PDF document text
    • http://dd-eng.com/files/files/67163785597.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/58373065656.pdfIn PDF document text
    • http://dip.natura2000.pl/imgturysta/files/sevejedajugi.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/kumozaluwomaremudosifo.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/gaxekojanituruvexez.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/welozetazene.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/95682070077.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/89006543514.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/77641807421.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/biromidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=film+online+matrixPDF 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_off0000aff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 10180 bytes
SHA-256: 5a5f448e9cc9579b9d031be4795b619adaf40aabb0c6b675b486b8ed92fa756f
font_02_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16116 bytes
SHA-256: 308a7522b702cd19dd83d78e033a51894a30f39d2e9e46a2242a81105a4a34a3

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