Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb9e3b921acff34…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 11:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9be92028724a85cecdcc1622a54477c1 SHA-1: a278a89dcdfa02312ab92b228a23dd5c9c31bf2b SHA-256: dbb9e3b921acff34f93c58cab2a9cdf6b81a52da54d93e8645530bbeec56e9e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious document intended to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gesundheit-im-blog.de/userfiles/file/lofogozupifelozetujibawir.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341883e8bef---pomigazutoj.pdfIn PDF document text
    • http://npas.ru/pic/file/lunofusa.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/tagesulovolezakelodonafu.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/71453819894.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ad13ilj6i1gjohsjg539has6j0/78221783045.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/dogifexunazugaxalatawoze.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/vosolofosuketudole.pdfIn PDF document text
    • https://comfort8889.com/upload/files/webotes.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/fobemogomip.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/dofaf.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/derajidobipalewul.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/deretizab.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/voxenuwizulutexinib.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/49064944564.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/89017565826.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613382d127c66---janupijonafozunavefi.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/86890139216.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/5664867639.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/50871935675.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/zozes.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/zosafadines.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/losasogesonu.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/51907882668.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/81160302647.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/dovatinitosixonedekofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=watch+greyhound+2020+putlockersPDF 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_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 11240 bytes
SHA-256: 43c62d248e1f3ae2895f8ce89418748a1a2579efcc2d7d5ddcf2d880bc886d22
font_01_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 19192 bytes
SHA-256: 1f8e3c3413114ffd29e2f9901fee880202fe2ea73d286ce8a761504b30511403
font_02_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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