Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99e7c46dd083643…

MALICIOUS

PDF

68.3 KB Created: 2021-09-18 01:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2a17f12e70be1d8ca8b8c3ddb66f8be SHA-1: cfd9d01f876e93ac3145de9d1f754ac6a6ce2525 SHA-256: d99e7c46dd083643f99aa518b7e8d0f0c51edce98319d8d76d5f84b9cbda0d7a
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://davidhammerstein.org/userfiles/file/gafudotozavew.pdf In PDF document text
    • http://mediacast.vn/ckeditor/upload/files/nonaginudilejiguwor.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/34612673131.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210908101113_381932302.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/38631281366.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/mutasebojazes.pdfIn PDF document text
    • http://precisao.org/files/files/kafenupimufaposabiseni.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/40568340494.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/30641092207.pdfIn PDF document text
    • http://jawarakreasi.com/file/xodinapavagukuweju.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409e8fbe59f---58430056287.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/15479316596.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f93cb290a---maxifiwelolad.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/58117074994.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/xegumo.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/xalesezefunobenekifazatof.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7b7aecaf---35266648929.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/rategixap.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/2510239632.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/37934384388.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/jowaxajopo.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/besudedebajuzixu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1nam3165q0v97kuoerr1ik97ht/pajuniloredujoxirinedu.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/femewunajivopuwikupirur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+3+swatPDF 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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 9804 bytes
SHA-256: 2820554b6a623807c384539b7ecb24f00aee090ebbbb07e6c799b86addded7bc
font_01_sfnt_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 14256 bytes
SHA-256: 4f8e853a780fa1c270f00df27b073c508083b443db6e4f2d4f751a153a0ef42a

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