Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc309e037548327c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 00:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1b36d96e67a6e0ce98e8f33963b8746f SHA-1: 7f6ab65443a01ebb610dfd0ef9bbec132296f77a SHA-256: dc309e037548327c463978aefde47b8b62c39e78a013aa16faf2e707e5eacf1c
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mrpokedb.com/uploads/files/98493949993.pdf In PDF document text
    • http://zussobrance.sk/grafika/dokumenty/45793517386.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/23530552559.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/55303797967.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/sobanigemoladufe.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320093b2b2a---sonedomusaxogo.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/340360835.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/jegimidefat.pdfIn PDF document text
    • http://effekt-film.de/files/file/foxukalebifasurerojavar.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390df68af0c---fadowagevifi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392b4023301---xuvigoxaguv.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/34841664507.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/wunafetodafev.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/rududifevu.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/pazipowasi.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/xixedogofotonafatiputuj.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/volekudasijakaxol.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/88422311657.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/31815077258.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/57776721473.pdfIn PDF document text
    • http://posuni.com/userfiles/file/gomejaxad.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/luxifunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=half+girlfriend+full+movie+watch+onlinePDF 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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 11000 bytes
SHA-256: b105a15ae99b20f5c3b9bbf448daf6fcf0d769121a57abdc723ef962d9cc3d58
font_01_sfnt_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 17192 bytes
SHA-256: 49e0f43b706d464f79dc13db1b9b456c6d388be6b306bd72d29788c7956a1e61

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