Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e6363f2f2219fc…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 09:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be5e800da9879112fdcff9a5ba2bb3b2 SHA-1: 068e584bbf8eab2e2ca281a7be78dbc463e763a2 SHA-256: 19e6363f2f2219fc26492aadeb5e0f215ef01ce2843f083d4c8c648dfcb24e6e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to domains flagged as compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catherine-massage.com/ckfinder/userfiles/files/8709996618.pdf In PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bujeganuda.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/14715727109.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef11859fa9---pajozotobu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9dc1fb03bfcc3e91ea0fe0803f4ce974/lijibitotaxifata.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/seluxigoteg.pdfIn PDF document text
    • https://gencatakan.com/upload/file/pameduxizarunamer.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/viwagopuneporadazizuwovel.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/81495809584.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qe389imnvvqrnri7j1525f46e6/76941257579.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/sagori.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/48714978516.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/lofuxefo.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/83696904648.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb1802cddc---23025625011.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/gezufopezetukumunikura.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/movotefosikupunuzij.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/17268974969.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/renedesijiludasijibirifa.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/letetuv.pdfIn PDF document text
    • http://ccadl.com/files/20210904160419.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/55185765701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=darwin+to+timber+creekPDF 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_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 18360 bytes
SHA-256: 78df83910485d6888dc714a2b6ca0c2c420e343d2c4a570e0e311dd7143dedd6
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 10496 bytes
SHA-256: 209bac95ca7569b994db29b514102821a448e770b63b50c1253353121490a506