Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ee1c52b8a0b19a…

MALICIOUS

PDF

139.1 KB Created: 2021-08-14 12:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 881516094df089b7d1051f1ef6fc8f9e SHA-1: 1b6331100ed2c97eb68dc78406d69f75751a01a9 SHA-256: 16ee1c52b8a0b19ac5ff29d6cb30e0e7ff0a95c3e40cb79bada9d2d9b09feba4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many of which point to compromised WordPress sites. These links likely serve to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b60b0652---25775623779.pdf In PDF document text
    • http://www.hgekc.com/media/userfiles/file/tovebalexivovox.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/suxakifit.pdfIn PDF document text
    • https://termoformat.md/img/files/wasifagibijolad.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/potabopixivunevinepotosex.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/2ed0247776e6f0432eb6675a028a986b/58484071131.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/45436297395.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dac39b182d8---69340116019.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/semunitimasosijozuxo.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13501900241.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ab3029948f95747a5589fa4fa69f99a3/vivumigid.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/51233250696.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/gowobibesizedixuvopeke.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5e252fc6c---8606819592.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/81914688255.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/63390794837.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608752bb4560e---zamapakozolodosepe.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/xinemeguzakosexofuna.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/36554986377.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/32254258915a97cf495e2174e70b3a38/9420007332.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1129cbdae82d3d0fd791b44a69f5285e/41117614960.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kexipowusezuzibulore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lesco+hps+spreader+parts+diagramPDF 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_off0001bd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD65 10768 bytes
SHA-256: 478729be4a1f35551cc9aee0623744f16ba35b2430bc45eace171e84f1ec18c9
font_01_sfnt_off0001d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D600 19016 bytes
SHA-256: 43d8f87514b15f1085da22b1a45c87b9f28a71ec5232f9c0577cc9f4b99a0168
font_02_sfnt_off00020684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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