Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c0eab24501f9c…

MALICIOUS

PDF

95.0 KB Created: 2021-06-29 10:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb69e8aec5b20e9bdd9b0d0f7c5b1b94 SHA-1: 7df6ba0349d3f40767c1ed0578f9d4c0759b463c SHA-256: d28c0eab24501f9c0c2605e49064e7e3a43faa5c2f2280ac737e599fe055a7e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to compromised CMS uploads and disposable hosting suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 https://chrmglobal.com/userfiles/file/tuximekagefukorudavurifan.pdf In PDF document text
    • http://gift-founder.com/archive/upload/files/8867450016.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/1jq5el8jo3qcmvsgh1i04r6jd7/wakajogozoro.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/68290681273.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b1a83b51---nowalevaxus.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c710ecc9e1f---rodunenenotigamixelinagun.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/15173759713.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/gisazizezetosovukadigeb.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a7fba5d1eed973ea660025ebdfecc1e1/lotov.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8858d370370aa6a903aa5d1e617bed48/zamuwodaxure.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8839fc7c07---xigibekesowudemedozogif.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083235c7a683---fimatal.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acf0cfb14---55130629520.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/mepupefuginomefawavejola.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/91371163750.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160967843d7983---wibotokud.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/tojavatobuwe.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/re69t3k80i2ih3fp2omgkgoc44/80649625341.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/95202378022.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pukovuxefuludefiwe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af938d38ae---jitupexali.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/rugavufe.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5a420c6e---79749734332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+step+pyramid+of+djoserPDF 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_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 10820 bytes
SHA-256: 3e6d98beede3e42edcf76ee77549d99c074cc953256cc967b42f6baa92ab3f7e
font_01_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 18076 bytes
SHA-256: 0deb133f4329e61d08f8c0719d2e8f7760208112105881672778c76d9a0ac41a
font_02_sfnt_off000156fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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