Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e21f86a59c23401…

MALICIOUS

PDF

82.8 KB Created: 2021-07-24 22:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a2c45da1546da7c46f14ccf0ed486302 SHA-1: bf9df419c7dbad1b4f1eb41beb8dbe1d5547289a SHA-256: 3e21f86a59c23401d93aedba6b6e80888c2b0d941bf5ff7e9ad76d9640e51650
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.cddfct.com/up_files/file/15910712943.pdf In PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/83713276977.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/65899367191.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/45432437122.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/74689763571.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/bfpfkve35pcqalh163g6p1snus/31377427230.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4f124f09e66c401d173ea36d742c79a1/79475961815.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kuvuwiroza.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/89580735366.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/zonivuwoz.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d7850f945---27192572870.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16088d75dc979b---8690974212.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b99c577ba6a5ac44f0ecd8bf78b1267c/71249492307.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7nkb28qsokmj6j5gpuq1d2ntjj/nitijopabovep.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kenasowotejo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d23cb720b---wudopexifogenagada.pdfIn PDF document text
    • https://digireg.at/upload/38834489352.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/q0e3mfniu3m0td3nbibb2upaqp/73443265721.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/94270459975.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/50c8792aca73ba434992a07645220652/11130301891.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/4bf8b5689dd8f675581f1f1bc2893458/molivafemosul.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f7fa1f1ed99---38504275435.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/sibanatatijunafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=o+que+%C3%A9+um+arquivo+epubPDF 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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 19376 bytes
SHA-256: 2803e9bba96e7d4a72d0a20749bc598dd498086ab95666cec380fcac60c9967f
font_01_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 10628 bytes
SHA-256: 7a3b077e2a346fe48c91da6dd9912d0b8cffd5719f6193eae04ee3f6051ba16b

Open this report in the interactive analyzer, or submit your own file for analysis.