Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb969d0af4ea5110…

MALICIOUS

PDF

68.9 KB Created: 2021-09-04 04:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83fe598c57acb3a24666292304e8f6c7 SHA-1: daac1a89ab1ab57922e98c439a033ca7f22fce32 SHA-256: bb969d0af4ea5110fe6ad17791879085bf2f7b20157407c721ecd50d5cca93a6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous PDF link farm heuristics and embedded URLs strongly suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://oddluzanie.net/userfiles/file/liloxomewowin.pdf In PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/mafugaxof.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/zisopuf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ta8jb5ha0eglk6p4u1o9k9tq20/riliserol.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36a811d85---98658167984.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/r1vrtftgip1tdm8chufercjfam/41119724424.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/kodanaxumekod.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75b82ba5a---95494903921.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/21056975985.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c17bec22---zoxixogexew.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f5fe08fd523723ee737e0269e035fcae/luralu.pdfIn PDF document text
    • https://olterus.net/contents/files/tuserozopegofa.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/05ed4173449825777ef5ca4a7b7d59dc/14800658352.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/44254749800.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160da63578c154---xazekejolinu.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/tugulibekivezopirod.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3862a8687dc1930ac812f1872ad8ad86/genipasifutotad.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/jefil.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2807b69fac389d91408a922677d61aaf/warosotolatuvok.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nazux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bls+manual+2019+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_off0000afa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA4 10732 bytes
SHA-256: 2b330d6e0931bb7ce450ac1d3998574f05550710226d89b074dc4500a8071ae2
font_01_sfnt_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 14720 bytes
SHA-256: e3763f15973b500ecde3002a4687b36a2a37c874826adcea8db2a92cf6dd0823
font_02_sfnt_off0000ed1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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