Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3818df1372f870…

MALICIOUS

PDF

88.1 KB Created: 2021-07-22 18:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ce4fdf345a26ed6bf397d4acf21aa28 SHA-1: bb17f8b63c554e645fc828e40aaf753770132f1c SHA-256: 0b3818df1372f870e468d0ddba9979ec3103fcb217209bf3bad29b50e52bbfc0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links to external PDFs hosted on compromised websites, suggesting it's part of a link farm designed to distribute malware or facilitate phishing. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable security software, a common tactic in malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://kcharp.com/ckfinder/userfiles/files/mafarefires.pdf In PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607773ea3ed12---91316708918.pdfIn PDF document text
    • http://candientushinko.com/images/file/33857067186.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sh4rrsj1nd7tdkanugpnrb282l/sivugajokus.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/s7ch3qmt5dogrq4ju6ge873569/xetixovegutepesuvipu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a187b48313---nifuxogasini.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jibekerotijib.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/98193038747.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/dividimupekijim.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a19caf1830fae38bb9b1c8d37cf7079b/30460198379.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b4bedeb485aca26497f1242410bc0510/93416015548.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/24730519666.pdfIn PDF document text
    • https://fallsplat.se/file/zakizimuvulajabap.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66514219261.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/72616050057.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a456440e9da---zomanuzegamulijazu.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c68eb164e665ea044c801b0cb322c72f/forepuxirepabezesetux.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/wewojigagexonig.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/309f1c9a044c433e6da681b99657e349/93282553681.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/68956923083.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/refevi.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b34ee0e46---komuwowob.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079a702d165f---17698856062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nck+dongle+android+mtk+cracked+downloadPDF 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_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 17188 bytes
SHA-256: 14e2a83281ebfb517e4394871777046bd67469d0945cbcb9bc92e53e3b08dee0
font_01_sfnt_off000121e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 10700 bytes
SHA-256: 8a9868dc27c901f6a4cd6d49fd1b5eeb78d31bd2a2e7f21c0bb5aa3e332285b2
font_02_sfnt_off00013a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.