Malicious PDF — malware analysis report

Static analysis result for SHA-256 5021e775ba241a86…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 11:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0243aaf79f9b135585b39076cf038004 SHA-1: 3c0f7579687b7cd4428fda9e6296bcd424bddb3d SHA-256: 5021e775ba241a86141817f084cc3ed6a192eca4a40d9d0e843e4f3c6fef29fd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sxhk365.com/uploads/file///52159083481.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58ea6ae44---10571923894.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/mubowaxuzeboguwunusinoj.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/taxomizul.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/28658859875.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/83913652907.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/72228646776.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/ronafe.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/42441685507.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/71982166014.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/livazuziwezerewavigaz.pdfIn PDF document text
    • https://kueapem.com/contents/files/14638336908.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/voxibexazol.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/60c7a3a98099efb8707044f95b1270be/58092204572.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338f7a3c3ea---tawajup.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/91351828091.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/10005400986.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1ddcaf76---35096618773.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/xodulerovidusi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf15acd28a---bolulorareresuwujit.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210909051751.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/o5g7547jlchifed6c81i0rel73/56075319289.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/73331131523.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161327c80ee7c5---26048314786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+i+cast+my+phone+screen+to+my+tvPDF 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_off0000d540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 17340 bytes
SHA-256: ef01cdc9bbd6e63edc6da47675eb2bda3bde64db428150f335127f1b8a7433c6
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10804 bytes
SHA-256: 140b6c68a4f7379dad0909d8d0fcce954192a99f688ff3545a0907d7b54550cf
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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