Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dd2e913118a1f7…

MALICIOUS

PDF

98.0 KB Created: 2021-07-14 00:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d08ccf864cb393435629564e6470a190 SHA-1: 8c8ebcbae8741d2b287cfc395f4abaae93cf97d9 SHA-256: 63dd2e913118a1f728c4b8d2df90f9d9417c8f0d1f87a2a79d8a0ce643377f3a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7g23pb7m8noh7oc2m63ftdqtnv/81048224280.pdf In PDF document text
    • https://semineebrasov.ro/printuri-fi/files/40845856327.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/68597571338.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0968a4f6a---rukowed.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0c38cb02---39714153382.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/psqufos5pth0lqo29brerhgmcm/12763232028.pdfIn PDF document text
    • https://doitoutdoorz.com/file/eRyMii1TCzngMeUS.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/22643019819.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/eejihik7vfbt3dpbeh6s98h1hn/nifulivefemofimefafowok.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6debc103a---21637152269.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/73810943098.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rjj3rfrddrtcbgh6oe763vfg56/68646588136.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/88621125208.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t9vgf43oli00pcebulaebuc2p3/25753518049.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jokejonoto.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/kixavotimazeni.pdfIn PDF document text
    • https://moolans.com/uploads/files/lejenefilid.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/xagodanat.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6dc77c5d82cca95145a50f92ad2d8aeb/dejapikiluzufevi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608782c755a76---59492718499.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/lojimaxadaribe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608009fd0082f---bozafefonogeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c875f92942c---61694387989.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4bb4a604---jifita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=age+of+empires+2+tower+rushPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 18808 bytes
SHA-256: 9e828908eebfdecc36c47706e69832952738e8e2108b780150a0f0caa45ad3b0
font_02_sfnt_off00014b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4B 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00016157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16157 10780 bytes
SHA-256: 57e4d5c5b471784a21e3e397b8d4997c986c12446a45988fab299fc3c137bea5

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