Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a026229fbc4865…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 09:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f80c2f65caa1b1f08ff31d3acd3742d7 SHA-1: b5a6042ef9a8a156dace751b333d83d4959ac88e SHA-256: 57a026229fbc48658774e5496117581cb5f1bb7df17896bdf4f784af19cb5a76
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/pjgp44v6n2rplfip1hh5rtg0e1/tirarotufazorinis.pdf In PDF document text
    • http://1careglobal.com/upload/files/bolotokazibizejokazojeduz.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/66026171041.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/xabimuxalak.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d582ec6506---muviwizidiwevorizag.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/i802a0o5hja12n35n1tmeb843m/376692111.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/67386612608.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/30342044685.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5829394f80---67592247550.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/bapufurunaxekaneziwa.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0c0ab5d5d167daf18b43f996091433bf/vevabuwigupanobobid.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/tosumaledigom.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cede4aa645d---24821579468.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/13081490262.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/mofuzexaju.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/mqala2v3060a7n42hqj8b7sc05/zesulup.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/nemozatesegogon.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/87514fcdace47727d50d66783a4923c8/pudomurojitozona.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xefevujejixema.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/rufevezadun.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/6909295161.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/69002978194.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0120f24a2---revudizovavejoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aem+fuel+pressure+regulator+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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 16440 bytes
SHA-256: 48dbe13cf4aca8141ca222b0ccd0afea16b80bc0f700c2bc14fc859b5317bd49
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F07 10692 bytes
SHA-256: 14e6b3b0a5469187d58729fdd9be1cedbf6e6a5f87f2fe3df93300da6bb6f15c

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