Malicious PDF — malware analysis report

Static analysis result for SHA-256 880c081881428610…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 11:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93e05045f33af58ac0f64dcdbbfd5dc6 SHA-1: a6eae16cbe5ba309984a79ef6bd9aca30a8b8c7f SHA-256: 880c081881428610dbd210d5b25e98381c81b4b992847628470e007195f8d159
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised CMS platforms or disposable domains, indicative of a link farm or phishing lure. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting browser vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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.
  • 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
  • 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://oniceh.ru/uplcv?utm_term=first+person+shooter+io+games PDF link annotation
    • https://satbietthu.com/luutru/files/28148759514.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lenamosixumija.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/93503393766.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc8b6a1c3e5406daddc9b904cbf9dfbb/80071348708.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/dukesezetanu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613789d73a257---xagaxozopegix.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/61179988899.pdfIn PDF document text
    • http://usmleworkout.com/files/file/pakuwoxiwelopevawujakoba.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/zupumig.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/denufunoxewe.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a492d14d2---tonapufenaxe.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/lodenotubugajemepizem.pdfIn PDF document text
    • https://ambalatender.com/upload/files/46829364223.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/texurididategedefesesepim.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/dutadikoxidasi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4a402cbc9---42124804213.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/39458535586.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09584ecf6---52487883132.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/23649459576.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/32848309427.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/49504941740.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/6268016760.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1babcb98e5e05454d840b8c849809c3d/tokigudi.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/tojenizelimugibizusaga.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 18884 bytes
SHA-256: 01211f5d0781910c976fa7c1c49d140cb24032e7bf10a5d75f2678f33e7c42d0

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