Malicious PDF — malware analysis report

Static analysis result for SHA-256 9706ee94d6236cbb…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 19:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 49634bc1b8ad81cd9d18c4d876c6b029 SHA-1: f1eb6767f1aee17d717e8263eee017891dca490d SHA-256: 9706ee94d6236cbbca616690f9dbddbb78e7b431bcec4d396e270a05fa2b8b88
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 https://pingthye.com/userfiles/files/18085872767.pdf In PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tufomim.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/levenoxapifaviwatev.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/92044558230.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d70603462---63752781036.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6438a68780aad8fc9cf610e5093e7641/76705396.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7a2e96722c61e3e0050d711c1f608841/suvasenefaledol.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109051909216393.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fofivunedejosu.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/45889934670.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/reduxobemanorowagigi.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/34472170174.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/didolijex.pdfIn PDF document text
    • http://budka39.ru/files/32314168774.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/93073629027.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/96499961719.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614278b93a1c8---20421261369.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/ramefil.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613452C58726B.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/wizinijodapafozalik.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/donibub.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/27507732664.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/jutikadadubuzitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=moving+fractions+to+the+other+sidePDF 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_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 18996 bytes
SHA-256: 754584b08e5ba92d401a189132bbe563755122b1bbfc6bd90d261b4b22b5ee7e
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 10768 bytes
SHA-256: c8c0e32f0c7471737d1584e634614119732c343ec8787fc250e4b47e2ace2069
font_02_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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