Malicious PDF — malware analysis report

Static analysis result for SHA-256 653a1f028058954f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 12:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 72a5ad5286c7d24c3e54a81c775e92d7 SHA-1: f00f88a415e093519ba3fe26ca3d1c41f49ca615 SHA-256: 653a1f028058954f4ed383d7716a69a3023f97c96a3cf7aca8d44350f7a965c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://telesson.net/_UploadFile/Images/file/bupesab.pdf In PDF document text
    • http://hzqzg.com/d/files/fuvapujisugexuvori.pdfIn PDF document text
    • https://duythanhsd.webthoidai.com/img-dn/files/dajirizixar.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/17973439617.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/66801038718.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/pederip.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e10dd08cf---41749485647.pdfIn PDF document text
    • https://cowik.pl/upload/pikupovunaxavu.pdfIn PDF document text
    • http://jump360.co/upload/files/20210902105425.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2ed7f7e65dacc13ae0b6726bcf4a8447/99947574334.pdfIn PDF document text
    • https://questyme.com/userfiles/file/14945397496.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/senuvomarugopabuxoso.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/54130708719.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc8452686---13127380487.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/totetufuzovizunavani.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b56396d41---35516211010.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/kosejeduliz.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/57764162469.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/juwerenex.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/98312580401.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142aaa939ebc---65765260649.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/mabofedilawetekaxafedef.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/meladigerevogibusokunok.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/vemokujifugofinap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+apk+websitePDF 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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADB 10248 bytes
SHA-256: b9f5db5e019ef6477f6fe5a1b21cebd8abf730ed7365cf76039b610eec372976
font_02_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 15120 bytes
SHA-256: adaf309d706d65d7c674e984673b6a727cdb0d216771a79c73c7345cc4ab1dfd

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