Malicious PDF — malware analysis report

Static analysis result for SHA-256 338fde2b2571abe7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-23 19:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a95a93a8452801396e0737f2d50f77ab SHA-1: 87f5d516971470000a0d6f873131fbe4a36384cd SHA-256: 338fde2b2571abe749bcf2e3ca7f3974a0b8dc3b592b6365f627a135422f6488
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking a link, likely to download a second-stage payload or lead to a phishing site. Multiple URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://another-partner.morefriendship.com/upload/files/gamimadosugazulif.pdf In PDF document text
    • https://clicksnepal.grnca.org/img/files/files/12625552443.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/dff4f65725c0928c9ca4e0dda0a66606/guvubagaxevatebuzomoz.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///wozuwukigawoke.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2aa959409d06b8e44bdb2e2bfaa0721f/25402933147.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/60300823240.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/lisepivonuzijosaginejif.pdfIn PDF document text
    • http://househouse.it/userfiles/files/muzopuwenexotonolurukovu.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/66556363891.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/levagonosuwabozegika.pdfIn PDF document text
    • https://cityface.cz/res/file/12586804163.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/84207037422.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/vugutisubedakixatokelite.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/rekigakaximumul.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/41837243422.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/85431360380.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/99726211247.pdfIn PDF document text
    • http://cissi.it/userfiles/files/wituwepodosi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146441d07d71---61109437703.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c96133af3---tenixi.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/kebimomaxofuwejazos.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/jurazulirowa.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/45430550292.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b243c1b00b4a3cab9cb454b5015a15fd/duzolebuloworotinis.pdfIn PDF document text
    • http://videlec.be/ressource/file/48755074954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=medical+centre+lennox+emu+plainsPDF 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_off0000b309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 10872 bytes
SHA-256: e803d01528e5d82d7604e6d7f53e57b5abf82a4de90741bbc65b8fa81698c1c2
font_01_sfnt_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 13920 bytes
SHA-256: 59bfb991214ffb66de906b15342d06a4790ed3fe5e032b6482758d91a1bf6f36