Malicious PDF — malware analysis report

Static analysis result for SHA-256 414db5567e08f847…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 13:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2980afac80b813cd96d588b155e0af75 SHA-1: 5f8a56a1788ddb73e7bc2dcae05bf9c36c4336e6 SHA-256: 414db5567e08f847b70f943d9fc2398c293a0bd1869adcd10dc2026ac94d9c33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious or phishing content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://basumati.com/app/webroot/ckfinder/userfiles/files/lawitekeravokuxonetef.pdf In PDF document text
    • http://vit-physio.de/file/11214013901.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/wibowabidolo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/40029970213.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/86382180152.pdfIn PDF document text
    • https://strechybenesov.cz/content/xozasadigaw.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/75776445302.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c981d6fd478a2ef2813ba8b30c51d529/91189634304.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/xuxuxur.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jamigukudutuwu.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/fekugibas.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8033c2cfc---77645198519.pdfIn PDF document text
    • http://sivam.pl/files/file/11974767872.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8k0933edarjoemc8jgcdksd51u/wafimuvofevukesiwadux.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/vatemajabuv.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/susexefidurixupuku.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/85709806893.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/jinawaguzabi.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/54937060388.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/fawamigeletukipuko.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614e77fb106c6---924593783.pdfIn PDF document text
    • https://norservis.com/files/files/28892437766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+ball+z+games+free+download+for+androidPDF 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_off0000ad3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3F 15184 bytes
SHA-256: 75abbdf0eace188b233cd4df8f629af3115edff4e6672df52d7e4561185ba683
font_01_sfnt_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 10888 bytes
SHA-256: 3243fa5c1a6e1319ccb9767f671ab17de1c7d9acaf1fd79cb52a816e170506d6