Malicious PDF — malware analysis report

Static analysis result for SHA-256 f435f2d97f6876de…

MALICIOUS

PDF

105.1 KB Created: 2021-07-21 03:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49010980940369ddb8b87f37a2924827 SHA-1: d088d1da585bef8ce63b9db6b9dc2e8b6efc8ad3 SHA-256: f435f2d97f6876de79429b592cd648e34b25fa0fbc1b73782473d7c1196c47b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, specifically using a link farm to redirect users to potentially malicious content. The presence of multiple URLs pointing to compromised or disposable hosting, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing attack. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 7

  • 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.
  • 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://sns.hu/_user/file/mubigidozuwiboregirogesob.pdf In PDF document text
    • http://3bbb.fr/ckeditor/upload/files/48813696559.pdfIn PDF document text
    • http://fruitvita.com/files/files/9011056362.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/41922326403.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080efc65a649---liwebepegugazonuz.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f18005b31c8---zajelebomakewo.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/7101451812.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/7sn90pnungahodnn0l5lirpnp2/zowanirigipag.pdfIn PDF document text
    • http://51www.org/uploadfile/file/cac2ae6b0a4c995b6ddbc2c645240373.pdfIn PDF document text
    • http://myqself.com/upload/files/zojizefelo.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/jawiwirefalikigixanekor.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/zufitabi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0ef74905b---subijamegomon.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3prde8nql62bafv2st62ub44c4/87309133322.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16078b201e7c0b---4213461039.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e79b57ee2bf---51394009597.pdfIn PDF document text
    • http://firegallery.ru/img/upload/91504288116.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b5c23ce07---64601146305.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/81603548827.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d979b678---51809477737.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a11518cf---15137082607.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d42f9d59a---20805472781.pdfIn PDF document text
    • https://rcot.org/userfiles/file/sobepisilosewezo.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/96174884575.pdfIn PDF document text
    • http://debden.org/userfiles/file/zufejiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=creative+cv+template+word+free+downloadPDF 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_off00013813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13813 16840 bytes
SHA-256: 038c418256b341745d5e95a7f6a7d27eac51fbd5a01ec15a69668f8bdf28695f
font_01_sfnt_off00016407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16407 10796 bytes
SHA-256: 900ca95d019a7ddb3ced3b81f7adc74b981f252838e7cd3811edcd0e59a0de35
font_02_sfnt_off00017cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.