Malicious PDF — malware analysis report

Static analysis result for SHA-256 775e4d24fb4674df…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 01:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d88e182c6fe147577c4dd0b8a20a7a8f SHA-1: c7bc39e957748cfeee4942f654217eb7734cb3a4 SHA-256: 775e4d24fb4674dfdb2a2ec67c2924583b1c8186c99aaec2a3c7603e6c3ba48e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external PDF files, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute further malicious content. The presence of 'utm_term=converter+pdf+to+ppt+free+download+full+version' in one URL indicates a lure for users seeking software, while the ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • 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://giriconsultancy.com/content_files/files/48045853053.pdf
    • https://juvelyrikoscentras.lt/Files/file/10306198320.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ldcfdnjurn9ph8eu1d42hjd431/migema.pdf
    • http://harryreichert.de/uploaded_pics/News/file/17415017100.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/sutizi.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609616db2174d---gubudijiza.pdf
    • http://c-amc.com/upload/files/4468411991.pdf
    • http://handbook.hu/upload/page/file/15693236716.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1018becc26---45497419464.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/db7411d7abd82261727459a138301443/dogex.pdf
    • http://massvt.sk/editor_uploads/system/files/romugasuvopeliroz.pdf
    • https://tavio.ru/files/file/36533904450.pdf
    • http://alibabashipping.com/userfiles/file/lidanexojududosiw.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/fikulexexixajuliwasozomew.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4f439a3ed2f126be105687b60cf6d39d/55618632071.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076084e16dcf---basukulaju.pdf
    • http://asahiru-ban.com/files/files/97785846427.pdf
    • http://griby.biz/ckfinder/userfiles/files/vizevijupebuvopulaxefi.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c91290714---rewuzonis.pdf
    • http://traiteur-ribot.fr/userfiles/file/51346945634.pdf
    • http://amongelite.com/ci/userfiles/files/lidokukelopuzele.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f71d397e---12125146899.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2138b2ca7---93862859599.pdf
    • http://giftboxvietthuy.com/upload/ck/files/74627339805.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=converter+pdf+to+ppt+free+download+full+version
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb50.bin
3a7a5530e84bf75fe0049926428b450fd59eaed89a40bc5f0108d1dd83928619
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10776 bytes
font_01_sfnt_off00010457.bin
021740ff5d7e2cb2a9f45b11346d0e0d6353b1e83857df7ff076f3385476c9e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 18720 bytes
font_02_sfnt_off00013469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13469 16792 bytes
font_03_sfnt_off00014c7a.bin
00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7A 16140 bytes