Malicious PDF — malware analysis report

Static analysis result for SHA-256 1189855f7cacf889…

MALICIOUS

PDF

75.9 KB Created: 2021-09-15 22:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea76c1d2494c28cec416e4bfade76002 SHA-1: 117447733257259994ff317f4df0bb946019a437 SHA-256: 1189855f7cacf8896baa23ae51c659a2f7f5b1e73b41ed929dc9e8c9f7886a92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious download sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://coretry.ru/uplcv?utm_term=shadow+fight+2+hack+version+download+apk PDF link annotation
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b08212c1---76803795104.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a3eba012---89375729099.pdfIn PDF document text
    • https://kueapem.com/contents/files/25164010985.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/51679011790.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210911055745_wb3g0e.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/kekodalurubovafofirebid.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/28163540498.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/53436056080.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/80572941051.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/duruk.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/puwebojusetojufebufati.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/515c0997ac463ae68c65104e6db6a267/382204625.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/tebukosajunadedut.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/15362235628.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/944b060ad9fc0d246ed562c5671340de/zixozomapid.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/zuzuvisutasenejobik.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/2579443452.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb8abcd4b---pusepefuzaneveviwode.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/84374654612.pdfIn PDF document text
    • http://getvisa.ru/images/File/70095361733.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/14894473577.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/31133427825.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///nudekukakupelez.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/27035723551.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/kerubujewuj.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16964 bytes
SHA-256: b959ef7c49d883a2eaa42cadfc171759d92ea1ed10ea99c1ed198e86b828e09f
font_02_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 11340 bytes
SHA-256: b833c6682854e0dc667a975fcc1da902ff70ba10632ccdaf8150e542ffea1aaa

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