Malicious PDF — malware analysis report

Static analysis result for SHA-256 b213dba944300af1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 18:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e5d31f358a49cfd059bb48ceb143c47 SHA-1: 683688e782cb155bfef1f7284abeabe371238b8f SHA-256: b213dba944300af1efd7f64c2dc7d18e34303b33a0b3ed37efc6cf6cb22d5ee7
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript and the link farm structure indicate an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pieseautocomenzi.ro/userfiles/file/66437681991.pdf In PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/11046492277.pdfIn PDF document text
    • http://goldmustang.ru/files/files/fenanud.pdfIn PDF document text
    • https://somogyplusz.hu/files/savixeruvipobekakofomar.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210917125511.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/lusidebitufutipupujen.pdfIn PDF document text
    • http://balalajka.nu/media/33575960526.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/23034557115.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210917150904684011azcgam.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/49021339103.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614520c92f444---tutipetek.pdfIn PDF document text
    • http://riviera.az/userfiles/file/dokudeded.pdfIn PDF document text
    • http://grabnerestriche.at/sigam.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/tutid.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2907b7bf---fakoneletifotolo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fomabofebad.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/90958803506.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/migukoguzaperajutisilenog.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/8070880765.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/50477646244.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/38765c06124ce2e56b2dbcf42a207c69/jazunifudeder.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7e36f27c---joragiladenedevil.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfbf17b60---23041424022.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0i4e6tt1uh851rbv3qon8dkgt7/kurozajo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109050926395958.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/du0ec1avps92fe9dcdkffr50om/12239177131.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/18511249631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=application+android+photo+effet+dessinPDF 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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 10696 bytes
SHA-256: 7457424b34413b2b27e506ff4b069e2eead3434ad584132275b4b2e2b58656f6
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 17472 bytes
SHA-256: a2dd3eda7eb21214ecbe016d3641a2c87988d76dd132148de1c22cd20a11d11c

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