Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc150b013390b21…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 20:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 051eac952bccce0fb9fa1715653b4db8 SHA-1: 55e4fe759c7814fe62a081da1519a409c4296d02 SHA-256: 3dc150b013390b21ff35737d0f47f6f54a109f87cbec9e856a2e0b7c113a43ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161394d825b556---samokadaxijazawupojigu.pdf In PDF document text
    • http://pepinieres-soupe.com/userfiles/file/62349558642.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/vuzesujogujezexeju.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/51845889772.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dh7a74h3a2s3vu3h14an5bf1n5/17834056731.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/59763033473.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6d38cf35---butupobasoxozisanuwu.pdfIn PDF document text
    • http://delve-cr.com/uploads/82751303651.pdfIn PDF document text
    • https://remini.hu/userfiles/file/papozakepoxifamelozil.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/lakodelob.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/56946827278.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/45086727362.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/59250986611.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/70824845398.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/39338605576.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/65646746274.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/16041162005.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/72509551462.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/zitibixuboraxasovelapa.pdfIn PDF document text
    • http://jadeite.ru/images/file/22862256783.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/rubawisobubenexojaso.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/butavujajuzuvorigoban.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/30027716051.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091814383299045.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/kurawakojiwowomamutiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=perfume+ebook+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_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 17020 bytes
SHA-256: 4fee31712a126d6add91e65e21bf996da13c977b0849d93cefb516ccfc46a3db
font_01_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 10576 bytes
SHA-256: f90d883bce15cecb4807b7af29c228893cb47f05aa34d17848c7fc80e9393dea
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1