Malicious PDF — malware analysis report

Static analysis result for SHA-256 769b12eed15d186e…

MALICIOUS

PDF

94.6 KB Created: 2021-07-16 10:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1f6cfae1effcfda824318c77ce6a627 SHA-1: aedd3c601242b670c6d8507edb7c8496bcab7153 SHA-256: 769b12eed15d186eb7bb7b42644c12e0dbb3554a051fc0652f5b8fe12b878fd0
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to potentially compromised websites and a heuristic indicating it instructs the user to disable security software. The presence of embedded URLs and the overall structure suggest it is designed to lure the user into downloading a second-stage payload, likely by exploiting a vulnerability or tricking them into executing a downloaded file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://verypool.cn/images/upload/File/44073931909.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/tufokadagupagav.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lupufebuxogif.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/89806510537.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6ca57a1229fd0e5d6d4974782a4697a8/56149772138.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a4a3d64205f7271688dbd15a21ba5094/42427773250.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ee462b91---puladuwipafekamupuz.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fof8201np1gp0e2g79qj2d65sv/kaninagabedotirukupo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/teruzudewegolejuginipu.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/bozafus.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ca67b1f343914c4fdd2e12ea5797efc/62026617980.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vekofajadujokaw.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/95987517810.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dee7ad6145a---27643991844.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cb98a268837abc6bd7828d141d636d8e/rafitakopixapujix.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c35c7fcd0---75455603998.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/lomomoxusowedovirosavu.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/65994125084.pdfIn PDF document text
    • https://studiorampinelli.com/file/38983573761.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/75306204430.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/7561767084.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67445be2ca---xujotafim.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0ivnvjq1rk9e1m3735rap7f0m2/fulidunagukekepiwugod.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/34852019493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+ravenfield+latest+versionPDF 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
stream_002_off0000f29b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF29B 17428 bytes
SHA-256: 8080bfa4f75e88417137ce024c2f086a433125df7f198bb33c0f4b99699b66f3
font_01_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 17572 bytes
SHA-256: ed3c53d3515e3a4f779a253d0834b41ed464fc8bdcfca42ef45347e5f7cb8d26
font_02_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CD 10500 bytes
SHA-256: 0e1ae1d8e1417134eb7b29bdd61e4ece905d198d50ddd012b5e37e996c79ed27

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