Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa76329661f0890…

MALICIOUS

PDF

101.9 KB Created: 2021-06-30 17:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0288405d619748afac323a4734e8fe34 SHA-1: 748247e70f0c07ffadc21ab57eb7a8338bcdce0b SHA-256: 1fa76329661f08905942fa4652ca550f219aae9b024b7f41fea9fccb88942170
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://smidgel.ru/uplcv?utm_term=subtext+meaning+in+drama PDF link annotation
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7aef95cd9f50bb92e6defa7e22c914e9/57679081455.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c24385ead17e174640bcc423ed0616a2/99679213684.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/gugavitepexemupafege.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8iv65d5bb93vj0l9v8tirhdkvs/11209529703.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/bosepogoku.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1fa58363fe8e76b4f3e83fc5a4bf5a19/63020488658.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8bf43bd04402d5c2516bb72070bf0a0b/19420782324.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/59306874635.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070b00aa9567---pajesexuxi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/feb5f64635780ad25c452031a6c31af7/devoxemopikujuvapipilo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/57bccb23a0ef292767d9ff876d1eb64c/jurirunefeda.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/85751151044.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/wababidazosirozukit.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/76848226381.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c889b36d0---38734958776.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jmeo630v4cnol73ce37jeoq158/7853559776.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160901770381dc---pijegepevexovatanabo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a61ac45560f---farebupolaxedokudurobolo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58348696dc---95567854120.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/54558e1a935d1266426eca6b90c8586f/53782031591.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a106a31e57---64666484701.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bf9f488e0---mozatapefekozamakubi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f194965a0---90034555294.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb7dc70b44---napabogudideler.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/88557596240.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bba338ea80e---nogadejuletovuwerakoguv.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16628 bytes
SHA-256: d7e578c18f2e725d9ac7888b2feee621851a3b52f5533bd90fe578d3ced4cc41
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 10672 bytes
SHA-256: c032ed4d516653b6badab098cdf8a583bd13b9cd15f1a29a5852832f42df717e
font_02_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 18604 bytes
SHA-256: 95c4542d86653b69fe7d586261630ae70e8f2d5a89835f8dd1c62d4f17b573e9
font_03_sfnt_off000164df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DF 3024 bytes
SHA-256: 21724ccf185aee66c2e57ca19499dbb0b72b8316cfb713de805cf863c661fe30
font_04_sfnt_off00017146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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