Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ee9a3ea09eae9f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 11:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1121b63e7094548b28324b10ac0b9fb8 SHA-1: d071858021e592ba33a4dbdf26db487e51b8c8b3 SHA-256: d9ee9a3ea09eae9f9ed63ac3541accf9ec9785e45c73471f23aa087e69381c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. Heuristics indicate this is a link farm on disposable hosting, likely intended to distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928290bcdc3---68567788969.pdf In PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/neginedasivubunuxusomanas.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6ca0db19---repowape.pdfIn PDF document text
    • http://gibisch.biz/files/files/dizalefewexutorol.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///88143002423.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/peridenik.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/vuzutizatilire.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xiwusaxitavozirutigurite.pdfIn PDF document text
    • http://armanetti.com/images/90845052317.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/bonolot.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/pavajexoseru.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a44f054c---xidopox.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h8vj7rbh9ii8qssd2u9r8sge44/wupebatigewitu.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/37182379525.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890987939aa---tasujilibawepaxa.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/rotusikemejiwaw.pdfIn PDF document text
    • http://tencanpowder.com/d/files/lekomufozuti.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/jexowakanidejujezokixulem.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/xaxageweraboxedivexuziluk.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/63510467019.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/bixujonox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=st+peter%27s+basilica+live+stream+todayPDF 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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 17900 bytes
SHA-256: 85fb80b343e6f8cc49582699a11159cee83c9f6a5794bf7bc1e0f5d165a746ea
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 11000 bytes
SHA-256: 7e238739f9f9d2bbb5ea5e8eb519ce7a275a988357dfa7eeddb8e5fd18e78abd
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1