Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1d5a2041ba18d3…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 22:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34f6dbdbd7195d744c13ddd196c99280 SHA-1: c88ba3a11f42262480ef771cbf6276873f80daad SHA-256: af1d5a2041ba18d38d288d0c4fabf9c8b79fc8226e61a2bf39c35cb3553e483f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the nature of the URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44279264326.pdf In PDF document text
    • http://naphotelbangkok.com/userfiles/files/kagebejojason.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2f591363c23264509f6df078edcf23c2/5568021169.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/99711523413.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/61411375896.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/60524112980.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/86321680440.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611640ccc05b7---52006767695.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/nedurasawamenukugul.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a05177b8220---74231971545.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/ririjori.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/79191125253.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/junusafubuzo.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/25475997323.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce23cf5be83---rukakitovisepuwi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a95a70281---nuluduzinenonib.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j26o8552q1kqjorcdpl38euk91/sakizafirizabepude.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b3311ca4---84490527762.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/wobegejodepajenusamowej.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108281157464525.pdfIn PDF document text
    • https://ms02bet.com/contents//files/68352700139.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1413913f6---vifat.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/pizodaxuvosifogaxesu.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/lesudupewasoni.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/remepajavowizotot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=teachers+guide+english+9+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/53c47e423c76576cdb9ae3d90619af31/kiwebiw.pdfIn PDF document text
    • 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_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 10912 bytes
SHA-256: d5971d892e3b679c173f076f9e0ceddc2e2cca9445d4bdd20645095a11522cb9
font_01_sfnt_off00010346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10346 18376 bytes
SHA-256: fe64ad431835689a6bf0309995abd929b2c52c19717e8b2a3116b18910a345e5
font_02_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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