Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab991cfc24fe5640…

MALICIOUS

PDF

97.4 KB Created: 2021-07-05 17:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98c1274125a59ddb3f5eb71f9a465904 SHA-1: 54214b7324e5cc34c4c179ae5499c491336e1418 SHA-256: ab991cfc24fe56405c63f64c6eb79adaee2f9e35ebc82397bb4ae6b9a06dae33
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution vehicle. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be to lure users to these external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d1467ec4d0b1f57dcf1cc2d6a276d7f/babek.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/6i05djblsk947finpjjav5em2t/39375542812.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d3g4prn7j198lu1p9rj2jba223/rufisewigomarugukomedimat.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/37642735592.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989e0c261a5---33743231354.pdfIn PDF document text
    • http://sns.hu/_user/file/vibiralowiwokenolaj.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/42533086819.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831654e57f8---69641056356.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/bapajepisiju.pdfIn PDF document text
    • http://capital96.com/userfiles/file/92936850973.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/fonudebovaxun.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/nakog.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/24d352fe929b543ed57151f77eb3c5fd/pibegametow.pdfIn PDF document text
    • http://groupkaishan.com/d/files/76556353079.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/27025721251.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f49e1930---zaramutati.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/99055074496.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/zewibimozanepuvuja.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d959759d4---jurukik.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160748142200c4---wovosebovamenewerixeki.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/43137857367.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/edb5af26e0f02a64fd00802e7456b402/61102006193.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29cc3f284f---nudil.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d62ae91fe---najebasivodominiziboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+polygon+with+all+angles+congruentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 18548 bytes
SHA-256: 2005c4948472bdf8e16f847c747040a34623abd1589a7d1eb508c2fecf40333e
font_01_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 10932 bytes
SHA-256: 45361b891a0d10e849339db98570e06954e9ba18fa55ed40588d1355495bde66
font_03_sfnt_off00015f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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