Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d52d2c5ec0d03bd…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 03:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a227243967d0493eeb103ea9705ca337 SHA-1: 0ab681fd65bd5b20055256b4afe3add3972cb442 SHA-256: 5d52d2c5ec0d03bdc2e3963affd3d8640dec9c4698af07c9e1f710baf01249c9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of PDF link farm heuristics and numerous embedded URLs, including one pointing to a compromised CMS upload, suggests the document is designed to redirect users to malicious sites. The heuristics also indicate urgency and download lures, reinforcing the phishing or malware download attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=sultan+full+movie+salman+khan+watch+online PDF link annotation
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/dotazogugoxixuremogetino.pdfIn PDF document text
    • http://linza-market.ru/upload/files/64403115660.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/tugugeripegogel.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/67923779510.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/jutozik.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/kowotexowupuw.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/60407398246.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kodopaxiwuv.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/736989494.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/begukofo.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/gibidivuxixikotesisaliv.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/wagimolozebutuxukemowe.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vavupomuvigejafogebumiz.pdfIn PDF document text
    • https://jagominum.com/contents/files/60077856512.pdfIn PDF document text
    • http://usagimatur.com/files/others/2483427184.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/71137610257.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/jupudizomarosib.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/lixubedogagotofu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b079028a1---85199820189.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/26961825830.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/19779414809.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/51133975213.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fceea2b275---zidibapu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03933d2fc---80102636479.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/84670157517.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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 18808 bytes
SHA-256: 9bc89f1e0a90ae4b32cac9066b207298a346ca8dca1f3f761e4c4b872aba2b97
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10920 bytes
SHA-256: 6e77fa442af4fab5db40ff4a8752222f72de1158aeddf0ca08340810cae2309a
font_02_sfnt_off00010fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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