Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d52ed2618af2fc9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 15:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d9b2169869cecc7be41ae2922c9e9f1 SHA-1: b227abb41f1a7172ef60b54b66bb0c0d56873fb7 SHA-256: 4d52ed2618af2fc99e9072b76650049110c0ef5b67c077bc8bb2c67a61e5a570
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious site, potentially for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff7e7a941---banuxeke.pdf In PDF document text
    • https://m-isc.com/userfiles/file/13547134571.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/20784177906.pdfIn PDF document text
    • http://ndt-ultratech.com/files/7863478634.pdfIn PDF document text
    • https://viceda.com/userfiles/file/60770755309.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/96082390027.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/wumugise.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138965f102d1---29510708946.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/fumamatukuvezizabisu.pdfIn PDF document text
    • https://kimansion.com/uploads/file/72767565126.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/wunuzipukoken.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/60214013652.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/n29u5ire64trcs6lm866qpcctq/motogobumuxofiwotakofe.pdfIn PDF document text
    • http://jaatkinson.com/userimages/23468478398.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd772ba8b---betewobasura.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/42916764028.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/jaburomapejiji.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/98128527203.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/52071951874.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/4191073776.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/95818646764.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109071201206065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=www+mp3+converter+to+mp4+free+downloadPDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 17360 bytes
SHA-256: ceac40308b8455f158d670289ec0ae8c9ac6a43026b59eadd510d2a78c3bbebb
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 10916 bytes
SHA-256: 9a7d503e8901296e5ee504a86bddb7885913805e60d2321e329f449ff6c1e341
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1