Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e239d3a9e4d4716…

MALICIOUS

PDF

89.9 KB Created: 2021-07-07 19:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14e2455129fb0844506319bf00293032 SHA-1: 730d0567521f30967f48a30597a90b455c20a492 SHA-256: 8e239d3a9e4d471650ac6a9d8b9ad0147777accdab0506ef8a5ce836322a080a
96 Risk Score

Malware Insights

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

The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters further support the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e5a3326b---rudaguneru.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ec8e90e5916ea73dbeb96e5895ec3ec0/12101504554.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57794041b---24443506568.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/50286891207.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/daruzexutudatepa.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/67113573489.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/bowuririj.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/uep5mhbjdn1gn1q456n958bvga/bononozebik.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba7005e50---89775321616.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d134030---35745909403.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/91725535058.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/gadukux.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/93252165913.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/rumoka.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0a7660362e6984c54d6b10eb821761bc/80896248620.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/78238793687.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lirataboz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b629988ff80---xedebejawuwuwarifunazugo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5972fe48f8---sazixudefajatiwogoji.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/90803475833.pdfIn PDF document text
    • http://sns.hu/_user/file/90187616423.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/1o8seclgpib823ncbmtike4ol3/80448321304.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f728879291---xibinajasoru.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/65157117065.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3432026404---57825104486.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608312b1a2378---mediravoxudaxofuxuseduze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=msp432p401r+technical+reference+manualPDF 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_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 11264 bytes
SHA-256: f3a191054d497b3e1024b7b730727cbaf35da99e5f73ac1255f0f1dd225502e8
font_01_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 18256 bytes
SHA-256: 9afa3cd2344b81bf9392d37acb6d91bd81ac033729472bb04596a92a3b1f36be

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