Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90693d4cdb43153…

MALICIOUS

PDF

68.5 KB Created: 2021-09-11 04:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd10b21b77c4edbd84ad302525a48205 SHA-1: 79264ca629473022f2c4c4bd498a252949ce684e SHA-256: c90693d4cdb431538caf9f39a38d836b02ed7000c4c4c42dbe45782523bc7338
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only appearance and embedded links to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://szerecsengyogyszertar.hu/editor_up/kejupowukigu.pdf In PDF document text
    • http://abwingssuffolk2.com/uploads/files/49311581589.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/katatixoz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb2c0d987---64805560075.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d57492f3b---39279033894.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/89261435262.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/49480934557.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/71682417012.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/kinatibulawonav.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/90637138319.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/sitadulomat.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/66029761854.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/nagigagabigutazufopiloniw.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/99879191656.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/ruvelovaxuru.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/demugugirizikupakebib.pdfIn PDF document text
    • https://onlinendttraining.com/files/watipamobo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4a22caa37---19662356809.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-2/20210902165336497831.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/wekebajuwogelasonagomiwo.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/3437152941.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/42328106723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hisuite+download+for+androidPDF 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_off0000b12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12B 10524 bytes
SHA-256: f1f3b0f05b494bbece8bc706326fcc129d9ed75a759bec82d271e71830267f0e
font_01_sfnt_off0000c94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 14096 bytes
SHA-256: 6403d6585901445b1c97615126a61d4e9be7c04b1e2d5c7261773941a71d0168

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