Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e765fd345cd6f82…

MALICIOUS

PDF

85.6 KB Created: 2021-08-22 03:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14e190325589e312fc8961c7a445538e SHA-1: 7de6b1251c7aadb4b1c2933e795227a770ed0513 SHA-256: 8e765fd345cd6f8254e37e7afdb0e1325c1741b87877eaae39242a3f1d90a614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised host links suggests an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ca166802c8dfcb790dface85714e1779/20468663814.pdf In PDF document text
    • https://csn-alliance.com/data/files/zemuxepivimozan.pdfIn PDF document text
    • https://ptogel2.com/contents//files/ketilatowigapugadutobe.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/20173745197.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086adb99cf8e---92269962040.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3cda74cba9b4f513873c3ae5c2b2e42a/66276177171.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/15680579588.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fdb011573---tizikadonibixuripoxekif.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/94271218038.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac726f559ae---82610319700.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/88557787915.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9c1728be337c395d99e34b39cf7d1cc/74389465699.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/16475678789.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/216aea4dfbb48e0ede06cf9d3b84e4f2/21273061605.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d9bbeb834d1005468cadc9ca3b808258/veresofonazitasijunevixug.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/virerogenejesogim.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161218a90d5786---zefazakebobivavedejef.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/jituf.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/rakodigiju.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/subiwomad.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160882bcacda90---femarirejivisuvuzujep.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/39557206151.pdfIn PDF document text
    • https://invest.pl/userfiles/file/34589683763.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/gajivegufob.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ffa4279046---gutok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=livre+un+secret+de+philippe+grimbert+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_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 11048 bytes
SHA-256: 6909ed4459c2123b14fd3329aad361f9d25ac3308677e81de4dde89e54667a84
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 19620 bytes
SHA-256: 39747a8857ed89e88af3131f3fa9089ab7784ee1d599e7ce67252c792a21062a

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