Malicious PDF — malware analysis report

Static analysis result for SHA-256 de29690700a8d933…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 09:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1bbe9244713d53f0e2e2ac243fd400a SHA-1: bb2534d9a5c7ebe35fb4825ee83606afa80182ec SHA-256: de29690700a8d933e4a888c368dea7e132974f663de02c06f2ef55f03dc1a4b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it is likely a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://purofirstli.com/userfiles/files/xagavivuxulijorufawojoxe.pdf In PDF document text
    • http://acecaalcoy.com/userfiles/file/1676894301.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086b3945bf7d---75561689763.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/36607303379.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b76bcc04011---88085967971.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/b72eda753441adacdab95342139fa0c7/64532971491.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/9c50ecd45567d5c09eda6e4c926770d6/gisapukojikaxarasen.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/70516214822.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b9cca7a5---siwomitazixuzebilutot.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607219b98f713---veruxonixojigutoruwij.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/85913596886.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kerekozojubifu.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210707043154663859.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kibudefokabanufetel.pdfIn PDF document text
    • http://hanleyresources.com/images/xawepuropa.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/52052122932.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7c6a0eac---26201609851.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103993c936c9---vasenabo.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/duvajuma.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e172b226c0---85551828480.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa41c40d9---91898029322.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b533fedf0364422ceb28576aadd00f9d/56551566280.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb01fc039e1---51054988825.pdfIn PDF document text
    • http://salkim.com/userfiles/file/tojojubonelovoxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tet+psychology+notes+in+english+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_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10712 bytes
SHA-256: e734b3412a6da7cc49c92d1c6cd74ae1ef6b58689c238ecd5814503e17a80971
font_02_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 18100 bytes
SHA-256: 23d741ee41f7d11a38f20f34c33eb81c28d1c7fbc041a27bbcb66b27f09e62c4

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