Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bee89fd9356cfc7…

MALICIOUS

PDF

90.1 KB Created: 2021-09-13 03:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e263115b6edfc82cc3f3d416cef040cd SHA-1: d46390f1b62e9daf437d92acec69cd3894526b4a SHA-256: 9bee89fd9356cfc79a98b5e00d927319c2394b5480401dfd23977cee8c8b3d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URLs. Several heuristics indicate the PDF is a link farm, with some links pointing to compromised CMS upload storage. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://drafthe.ru/uplcv?utm_term=boruto+anime+1 PDF link annotation
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/lodis.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/wixodelak.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xokanuwuw.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/46348983028.pdfIn PDF document text
    • http://twilaw.com/files/files/61284791525.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe43bb533---6876608418.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b9kus2ifd2e8aeaqn25cs7i72/tavesasepalanevekabefobag.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/daxipizojopevapopojufi.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/576686449.pdfIn PDF document text
    • https://ms02bet.net/contents/files/14675177053.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/tizuzatexevolexeso.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/18675174650.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/52186008167.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/74914331563.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/posaxulitopagetijusefete.pdfIn PDF document text
    • http://schokofontaenen.de/idata/rodigun.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94619207a---jizulituzilepav.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/73022886764.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/87102164304.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/latuduron.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/03f35cdc61451ded031803bebbecca89/momosatafewifakimuvi.pdfIn PDF document text
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 22528 bytes
SHA-256: 519b9937020bde766d2191904dedf003fb644e2c36acfe7a7da54c7c1ff3f7d5
font_01_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 10260 bytes
SHA-256: 56c353559c645eb8d43b1968c4c8a9c21ad07e407a7608f5791b810975ac9cd1
font_03_sfnt_off000144c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C3 16652 bytes
SHA-256: 465660eb539fec501baa3527704f90d862a85eae338abf2b905d8f7c60100337