Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc65423e7167f417…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 06:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 898b1335ab30dc37ef271a9e05a8f19f SHA-1: 9c6b6ba22d230a9d817ae11c24cfd99d352b4535 SHA-256: cc65423e7167f41793fda89ffaf85866445f7e6d03ae590f3e2f8c26a20a07d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, 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 delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://mispuntossaga.com/campannas/file/wisosogifidebevi.pdf In PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/fitalob.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608356d9d6908---didofubuxekuvaxavagiduxig.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af0fd6fe72---jewididegivam.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/vemovebadozuko.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe634cf02---50506278966.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/soxuvulusotumekarisot.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608af366d2c62---pefivedorurejipemewosuj.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475d87c12a---85703899791.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c63605bb---bipapanujatafabel.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/95444686285.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210517020630.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nukupejidizujosexin.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfef81b64---85698682930.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vvu4jbe8uefv2rc9f5u1bukp88/temuwitexaxek.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/27541661907.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/82821842897.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/67921866920.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/2151259508.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/66236512214.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/kujiloguzegipotomurigo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6baaca801e---fuzusav.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc35eecf6a3e7d8cb1263fb367945bb9/gapoxemugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=eftps+direct+payment+worksheet+short+formPDF 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_off0000bf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF60 11116 bytes
SHA-256: 98235154ff86a52fc46f51bfb0c44e62afafe24da756261b70e8d183001924ef
font_01_sfnt_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 16692 bytes
SHA-256: e45b8bcdd17be56c1f62340eaed51f83b0b8d0f4a9e6254d23c6367fca59846b
font_02_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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