Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca0ab42d0743bb2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 21:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fae51d97f567b95da722666c646047bc SHA-1: afb1a063ad46982d1712b89a972d43529a952385 SHA-256: 4ca0ab42d0743bb2d71dd5d3ce5071824d282a3cacc39cb8021cf1cff8a20748
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple unknown URLs suggests a broad distribution effort, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/54d195a8e37539d281b02e0cf73eb98a/gowetawerinu.pdf In PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/88591981680.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/61335654063.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/xazowiwutofubosota.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/xedavalikenutogawagaf.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59390f1cbaf730360dc88e72d520125f/suwexulemutunimuvomad.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/16153599788.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5dea35e5d80c2b3da347e46d0f262061/kunubozijabubozomaberor.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/fixamanopuvubupan.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b800d4a35c7---30210510702.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca834ee19---visisapepefader.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/31807688198.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a050e610ac5---40053239301.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/lofizi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a22273d474c864830fb23d6c741cea79/pefemoperiwevebi.pdfIn PDF document text
    • https://slide-bearing.com/d/files/59631229474.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/mujalenutezexamurot.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/tevorunigodizabenu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/41730422663.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/kofure.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k6mp564216toudbur7f1s58khi/71212915705.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e69c0eebd---21148952455.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f7e68fd3bf602b59c60ca7391a361b19/59334131584.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086aff6d1f1f---59590727993.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8f831bef---55846429523.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/76552765975.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ffea13f1dda49c80ee57e2789fc9cdc3/wusegiwabotugon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=simile+metaphor+worksheet+middle+schoolPDF 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_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 17520 bytes
SHA-256: 8c63ec92e0cecbc3f3a1ad1788751679bfe2593646a90f2d251424229547bdf0
font_02_sfnt_off000126c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C3 10928 bytes
SHA-256: a4c230694c308d1057c604a5d63c893b50307e877a845def775c106910f34953