Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9667fd8e4bd0108…

MALICIOUS

PDF

88.2 KB Created: 2021-07-20 18:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f59ff1d4be619a8e553ff697e0edad8 SHA-1: 666856f19401e043f9d9ed699f265e683bad51a2 SHA-256: c9667fd8e4bd0108b9991858dc8512162b3d88ba734bd04abf589ae1ae2ea11d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. ClamAV and ML classifiers also flagged this file as malicious, specifically identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

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 http://quick-thailand.com/images/uploads/file/78171788229.pdf
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/17045720547.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e358ced8c78---26676940077.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/negaroxijuda.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aac6048a642---kixawexodikawajen.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0i84blvis0as0dh37gpj4cgnn6/demamutumemupedako.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba28eb9f03b---35760726481.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80bb4cc2e---66050354098.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa8d7d6f60---15590393770.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c84258144267fd6dfb5f5507b632db9e/vokevudujatafuvapubon.pdf
    • https://atamergranit.com/userfiles/file/42347314701.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d438c9b6---roxozusofagamuwepebiles.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed5f4bea9---nidinebopinelurajibij.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/areh7fblqvl7ad1di97sipe6lo/32097231597.pdf
    • http://sartor.ru/upload/files/26290292831.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hf8qfcjo26sluf3vgq64h79p5i/95382832860.pdf
    • https://jf-orvalho.pt/userfiles/file/mojaposu.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/607f973f0ad9f3b38f1ccc02e4aa6d4b/67356538497.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/oi9i686tm9ulcdged6snhm08ms/zibitejafolakemoxori.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c2f3a6f8a4650c6cec98584c2d35921f/dulakutemizidanu.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/50792868398.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1afda5a22---62470080254.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9677a19e---pubonuk.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6efb9997---pikodetuva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mental+health+nursing+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44e.bin
b0e6a5afa28e11b62735603aa9c6fc29f90695f79b54965dd4a5bf0ece95bc69
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 11104 bytes
font_01_sfnt_off00010da7.bin
f9bc212d2e99d0f8afa2a05d19a61af66a0e92c5fdbb66b96243dbdcd72041a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 17200 bytes
font_02_sfnt_off00013b07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B07 16792 bytes