Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99f8a662e8985f3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 20:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a7b179df85e5a036518475e1ba9c6c7 SHA-1: afa512dfc8bcc49881363087a8dc9a148664bf22 SHA-256: a99f8a662e8985f396a3283d2520878b4be9f74f353b7c52a066426d5e676323
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV, indicating it's designed to exploit vulnerabilities or deliver malicious content. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://cphs1970.net/clients/877309/File/favogepiwebolaxo.pdf In PDF document text
    • http://videofilm-tv.ru/content/File/kolepevibezipawe.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/45782374298.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/zasiwof.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/luzimesixinorule.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f898112e64---memikopusefe.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/pelalozozuvuliduwupitez.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16123480b3a7f9---81819953291.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78ba5f56d---99615380408.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/xutabokax.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/butafogepazelebalabera.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///79183138385.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/30673115761.pdfIn PDF document text
    • https://samowar.me/userfiles/files/73251742061.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/38583299239.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/tadogajutasopetubamamusa.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/gedum.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8cee1ed5---vojuwujiwulogebutikik.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/62r2csidmicb6g983m0pel1tuo/68569310216.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/64889368862.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d34c388eafe---sogosunujabikeguziwive.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5d60dhagilru31tj7i2ukorn75/40983382842.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/bumagodigufatomilud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tucked+up+in+bedPDF 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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 17336 bytes
SHA-256: 982c1257b4c59d8ef24e3ed40d7e6591076275ae6289b314e640aefc95fe7872
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 10108 bytes
SHA-256: 2fef4c9bd579299bca3ddcfa81de8d71d58985d40b98f3bf9323cfe47ce5eeb1

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