Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50e04cf6ea75248…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 04:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec4acf337ebab80c9576938e49398cd8 SHA-1: 5304ed7d69940f6f9cbe6eb1daad673741e00591 SHA-256: c50e04cf6ea752483080a5f5cc47dd088288b341cd82c2707b5cb540b80c64e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd671186c---52699937888.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3a47ed1299ba3d8b83f4b10681372bf2/21392332921.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/revilulovibetafix.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/31432832483.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/birogezujowixamigolalomug.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/kogasiradozadowob.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/46081629848.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/jiwazetamopugi.pdfIn PDF document text
    • https://diphong.com/uploads/42926619092.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0adbb1a2f6---35495384433.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060ef91a0c1---36730918431.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53ff417389---bexiz.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6fa21d0cb3d5e66d082373cbd4fd33d9/56927806800.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/17746156178.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a798c77edf---5485186668.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b84e7863f---53008287821.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/89200031367.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/sopomuzilulowetogaxanuro.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/jotaped.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f90e60dab---52276218459.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c8521a7e---98085503845.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/57227906416.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/30013269395.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9db861a52---99220812272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ariel+sylvia+plath+pdf+portuguesPDF 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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 19036 bytes
SHA-256: 1461a6635c345a7c68a22e514d0edefcdcefb463c6c493423ed577fe23c9c3fa
font_01_sfnt_off0001061d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 10932 bytes
SHA-256: b69a0a793d3db846a35a92c6fd6ef041f62013827742cb96500263aa6a9d64b3

Open this report in the interactive analyzer, or submit your own file for analysis.