Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd29aaa0edb5274…

MALICIOUS

PDF

93.5 KB Created: 2021-08-15 11:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96c557e8464c83d973a7c9e431d56447 SHA-1: 40217ff540c3638b660f14d45a35a1fac153cab9 SHA-256: 5cd29aaa0edb5274cf2ed44eb25bedb0dba7a1abdaec734e72a0de76a14b0d01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to potentially compromised WordPress sites, indicating an attempt to host and distribute malicious files. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests these links lead to malware. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://proia.bg/userfiles/file/lurozasowanunaxa.pdf In PDF document text
    • http://rydelko.pl/userfiles/file/99977281424.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/wududigufepipo.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39e9d75ce---gatati.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cecc54cb3c7415be3ef065ab4cc075a4/zezute.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3c22ff31---69230390452.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/9703023107.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210618071025.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2111b8dc1e9c6ed52a0912ad1a13ba20/95879748398.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161061541570d1---63802694827.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/razuxodug.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/zagowipo.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/kilavata.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/55160390365.pdfIn PDF document text
    • http://iphysiology.ru/upload/nizotefuxidasiwu.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/72bd8179ae8278eb4d14ff86ca03e2bc/60875623351.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rebix.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7da22169e---45467636885.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/29416486414.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21f59a0d0---wexina.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/fuvomijinakaj.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68079a128---rujigapuzixadusukusime.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/94311162839.pdfIn PDF document text
    • https://vendax.ro/files/file/gofeboniwewej.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/dewukujenimo.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/vizutemebejef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=actividades+de+lectoescritura+para+ni%C3%B1os+de+segundo+grado+de+primariaPDF 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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 16632 bytes
SHA-256: 680e586a1ee573e661d30ea0f7a97a8805d5b79b2e3d5282e6cd27ea8e1e9edb
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 18888 bytes
SHA-256: 82339373f857d9241b60fab498af9b33aea4754a576de2fe05c00e803d8581ae
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 11212 bytes
SHA-256: 75400c8ca819a50b715aeb9c6b93372c0c8f8b2ed3840a1b392aa53538dabca6
font_03_sfnt_off00014ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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