Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b8c74ce0e1ad1b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 10:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 180719e73affa53c718b22a3c0ed173e SHA-1: 356190a821774554a239ce327c6b6b171af5e94b SHA-256: 48b8c74ce0e1ad1b18fdaeb8d4832c5acbcc0a15e78dc1f08c2380dc2e23e7b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely leveraging social engineering to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://philabc.ru/uplcv?utm_term=usb+dvd+download+tool PDF link annotation
    • http://saatgaamkansarasamaj.com/admin/uploads/files/33929359671.pdfIn PDF document text
    • http://yoron.net/up/files/55018403098.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/58604597793.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tufotugoge.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/92194469587.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/89828646308.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/14929179599.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zuvobufuxetiwemutatibapa.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/gatin.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3a85d7ab---25072479119.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/povigijiwujininuzo.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090909433280554.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-4/20210904112941786464.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/gogoxofuvatufusa.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fedajapepisazu.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/39870168683.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8327ae3227501976d9bf50024717b4f1/subomag.pdfIn PDF document text
    • https://penzion-palice.cz/content/2095373414.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/46359589275.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d4ed1f74e2d55f88e4b941a8f02e9dcb/xilixigifotivojikulevute.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kafex.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/gigatupiwiluboxifo.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tunifukibigumukureji.pdfIn PDF document text
    • 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_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 18448 bytes
SHA-256: c1e7f4e739a7df7c874e7aa79229ecb85e8b91349c7de59fb0b1a26804539e43
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10216 bytes
SHA-256: 68b4317a9d46a6e64e1afcad839374e693d3cd1516f882059acdcdf98632bcc7
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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