Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11f1347c279a361…

MALICIOUS

PDF

91.8 KB Created: 2021-08-12 09:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 500e25302d3fce49a6c125b4548a27de SHA-1: f732dc66150521f90fef338c60f96168ce244e4d SHA-256: e11f1347c279a36181e85f307f8ba347122447fc1157bc47ed17a0aac7fcebc0
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c885f0a3613---90522744899.pdf In PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021429173468563.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ji9orkrda0jf40j3u5chanuct0/57012143072.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/54919509959.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f200b60c5115682f9852d264d2a7bf1e/jezeve.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608496d932b8f---4818654351.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/30329984514.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/89919910811.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b5ef1e5ec3cd4822054671067f50562a/lugemiwaro.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072c386a6fb5---zuviturana.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8oq2h4gmu221d8nlcgcf6gteji/sojodidomesovik.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/051430dc85466e4086fe6a8f63230f43/89203564430.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464f13db86---zuvojomorug.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d54bb6e9---zosajasabovedelizofegabez.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/19979072084.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b13a8e1239fc880111f0aea5c4ca6911/dogegusosunizufigoju.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/67847019182.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/kexexatevovanakifogazas.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b9babc43fb73170df2f60bf1004b2efa/fozen.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f6f64dcf---90312841375.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/81145528060b4b3cb46c3b.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/vubujiweloxivofiw.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/61970940299.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/36230827579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=video+game+center+business+plan+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_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 11172 bytes
SHA-256: 37e6441e64b5f9cb57772d1c24abc3ca9336a32149a5f890f939669ec74038f7
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 17672 bytes
SHA-256: 74169ddd7944a72f267fd0db7a3b43349765f88be1012fcd800655dabc4d2054
font_02_sfnt_off0001480c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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