Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5efc4ad6b16488…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 18:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e32fb9a6dcfccb9d7ec1c6f0b04e0a95 SHA-1: 46385768613cbb449446608975257bfcbdd72924 SHA-256: 6b5efc4ad6b16488b72124e49a1ccbc1ebb8c9d4217bca3341558b2c41649436
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests the file's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://huntic.ru/uplcv?utm_term=four+corners+strategy+pdf PDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba20c96b990---nekajuxu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa95a7759d4---dezuvalagonopupezofore.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094059230a9d---7944775721.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/pakikufirep.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/gavamewidogo.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202108151613437789.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/navefamoruji.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/sojav.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec6e21f229---35901155985.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/bazujenezesalulapapox.pdfIn PDF document text
    • https://micsys.in/userfiles/file/11831552254.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611639d60d14c---39081447274.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1611e365c7f661---pitexapa.pdfIn PDF document text
    • https://bczenekar.hu/files/file/20414761395.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/70179347898.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/60505381877.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4083c6c0b0ebee676b45127ec0eb600d/tosenivur.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612692fe8123e---webaribomivowo.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/wisaxebipexutokak.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/30/file/10069106955.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202108142144304222.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/xekog.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/af8339d1df83dee1c296ff01e1e74f61/fiwedojumuwurelafisibene.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e182ce1886bbe6757f1ef153124b57a0/25366609044.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/tarerizafadetifazizo.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/rivudeto.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c528460c---56110085282.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_off0000bdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD7 16776 bytes
SHA-256: 1cb9dd2e3b3abb83c05d1291ed3702dfb512826e029ede195765fdb74006b48a
font_01_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10848 bytes
SHA-256: 52cb2f4c6d71b2577817e9e156e9e456e6024e3f63024f6825556ec3648594f0

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