Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b858f10fa1048f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 13:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89420e459f1f45524899406a8e57a59a SHA-1: c315e5f4835ce0e75d0b4c786933ae5c11d367c9 SHA-256: 28b858f10fa1048f58a4ef17439b31c549fcb374eac47c1507b7c1378ad9dd0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mydreamtuscanwedding.com/editor_up/79212128984.pdf In PDF document text
    • https://ccaquebec.com/userupload/files/16020575571.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/kaserosepifamupafosalojor.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/44733243544.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/raxexaken.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/158119d4212607073e32ce6561c11772/kodew.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/6290758974.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096364b7ee4a---63891374263.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/jatejejoxe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fe1532601f---80224366167.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4e4a18513b55e20426e051671812d66e/88679508499.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/sefajup.pdfIn PDF document text
    • https://soechi.com/userfiles/file/dowisivubumutemirukurasog.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/pivewikizugu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pevegateminulerafik.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c7f2206d67029998ff3aa8219a20713d/tosenubaxufuruvexiv.pdfIn PDF document text
    • https://limsurempat.com/contents//files/ramewekawa.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/panituxineva.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750e7a926c4---28887197672.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612abca05bf01---95340079460.pdfIn PDF document text
    • https://webhosting4.net/media/file/91031041462.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/vemoretudebi.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/62025325205.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/4385179487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+phase+change+from+liquid+to+solid+is+calledPDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 18832 bytes
SHA-256: 86891313dd38a647cdff190254b264430de3a3dcbe02c089be307727ec1b8b49
font_01_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 11276 bytes
SHA-256: 764cff662c269a39a369dd24f29411a4ee3b961156f197a69b0f8000d45362aa
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1