Malicious PDF — malware analysis report

Static analysis result for SHA-256 768300e1535820e9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 13:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b20ae4544e56d49f0f3ad68fbbf8dbde SHA-1: 46ed527e1d1e79345c735cea6ab66e529ce380de SHA-256: 768300e1535820e98abffb8cb84253c367ec85e48e5dc84ac9e41473b7aa6574
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites 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 likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d0be6ec6409---siwifovibisuzeruloso.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/325889a118b13bf90419684a3f9ffcbd/77772436228.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/pavogo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070580b52bde---jupawazulabukuwig.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210513/210513152429627104z5u9l7ft3n33.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/69717556660.pdfIn PDF document text
    • https://agatanorek.com/files/file/32367797594.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/vifinisolaviner.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/70058950805.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/13499781467.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/27653778036.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080263027f9d---89175025797.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc95a114289---56319532096.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/6464337872.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34899871639.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baca90621b4---zobevimesosafaxemi.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/12ca8dfcd2cd5810057029d088390f29/besiwaza.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/gawuvikagamop.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/gakebusowarozasas.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/ruwumoxividusemegilinimuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=esp8266+12e+datasheet+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_off0000b6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 16544 bytes
SHA-256: 13060696d40e385ad5a9f25d683c536cd1026abd340ecea19c9ab3c8171be398
font_02_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 10664 bytes
SHA-256: 2cca50744ec3261bdec1190461c5ffb1012c1e00a8fa424d1ac560ded96fc258

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