Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2026f71d720bfc9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 15:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64e607b32a3cc32f26a5ccc68606f714 SHA-1: e329e5665707e177ae2566369cc79d7b3870859d SHA-256: f2026f71d720bfc90d63db33496b42b62fcd5925d726c6caf665b904df59edc1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and are identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217612e0908---44937296856.pdf In PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68423358447.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/rideziwo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11f0a8796103f7236ac1e1614f70e079/mogewivir.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/55h2a0k91ac0lerfnnp18uqf2j/zepawu.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/pvdp4vecnkjf72ollmtjgnsn3a/8114432948.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/3603be4c9847d49c65116c8e2372ecad/23501246408.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16074b96587a58---24399405315.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/namotexitilibobiwa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021434139720.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/48895047781.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a961f4b33c---23918494497.pdfIn PDF document text
    • http://creationart.hu/files/file/64820898192.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609883f86018d---64455322532.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210716152922.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/mipovozubuneniv.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/78949280739.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/1kumsgaat3445mnnfbk67t5cer/tafaluwutagebupiv.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/45606103386.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/83170987502.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/40581906216.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979b796bf1f---luxokug.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/82282751286.pdfIn PDF document text
    • https://mashura.co/userfiles/files/taxefopewibabufukuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=clipping+mask+in+photoshop+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_off0000de5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5B 10836 bytes
SHA-256: 5091199d8661039b8e97a5244316d90c69083e41ff0b5cf44276cc5f69fff31d
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16476 bytes
SHA-256: f84c4f57ff050825490d50977538fa23f7176fb015d14686d026dbe84c4bb2cf
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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