Malicious PDF — malware analysis report

Static analysis result for SHA-256 5841a7358e5ba030…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 22:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a015b99634a5d520bc26bf96f6108f13 SHA-1: 058008652a21430545ed91a17e807abf3a477636 SHA-256: 5841a7358e5ba0309dae5562afa04ec564c378eff10bb40f7f735dee3904d025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to malicious content, as evidenced by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdb7b8e4e---nolenigopiduxuvasuf.pdf In PDF document text
    • https://fsreloading.com/userfiles/files/zuvezixagozubodamipebip.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/18630246055.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e53cf4f90e16183a5e39cba606f497c7/wodaxenebigoregaxot.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a52f4383d61---puremiwetitutigumik.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a05f6cc5e7cea3140cbb2265064d64da/7557792087.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/509dbfc0f45928be743943dec93a2c35/20233222128.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/v9i5a71d013qk64l9usuo3cir2/30581186213.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ecfb1bec615---kovalinitul.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/guralivakikipokufulu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f2fbe53ba4c675d1f93acbc6795d06bd/66347179514.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081817325123154.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/puzopagewuve.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/97332750437.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/35713045611.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/70541758267.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b5e77afa0---susexinofef.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079763b46f89---notamidujavufi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zesagivotumimagato.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/2041367552.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202105104951_24024105.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210731090638.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/31060274869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=financial+accounting+tutorialspoint+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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 17464 bytes
SHA-256: c811ff79d87ddb9266e594d24588c2ab7617ae0a6ba54b8ea04079032485dfae
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 10740 bytes
SHA-256: 38c39d422896fb06bb92ca6e81b37f1b90ef4d87a267f01144f053b135f3fc8a

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