Malicious PDF — malware analysis report

Static analysis result for SHA-256 c216274106399dbc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 10:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5761809250a70a254a69ac95d84c9450 SHA-1: 9fc2502089954e272296ce24b4fbc58ec69a922b SHA-256: c216274106399dbc57d3ac8d7427192b2da280242eb8ab43524e70f980dc0465
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a high number of external links, many hosted on potentially disposable domains, suggesting a link farm or phishing attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common method to bypass security filters. No scripts were extracted, but the presence of numerous URLs and the password archive lure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://kco.su/userfiles/file/pulugitarinoz.pdf In PDF document text
    • https://casabresciani.it/uploads/file/74583308054.pdfIn PDF document text
    • https://zagi.hr/files/99475819162.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/79959876702.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e862a88fdb---57124863079.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/cmpid87dalivkohi44id1vkgd2/gulekikekuragipifixow.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/61590539718.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/lafazejigejobotufibefi.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/biberusogenadagebawu.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/72530080710.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zamog.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910071531107.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/nizebuzuzolebilabeta.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348cf4c264e---70468143698.pdfIn PDF document text
    • http://ruresept.ru/files/file/79171030510.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/39723976023.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/fuzisuxolinidunizez.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/20653715121.pdfIn PDF document text
    • https://gornjastubica.hr/files/sorujimafumovov.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/71023747228.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/gemuvanofezezoziki.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/wixarixo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53003603838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+up+wifi+hotspot+on+androidPDF 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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 18508 bytes
SHA-256: b5d326a55b004c79abbbe8943cc33ff50ef88b633948157eaf02b64c463ac8d4
font_01_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7C 10724 bytes
SHA-256: 586b4b869f4cf1954a755c743e72f15ef8a6db5324b00f0e7851acc94ac5a6da

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