Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f57b032c69eca4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 00:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 797fcd19aeaaf60ab20d71fae9947a92 SHA-1: 597fd0eff4bae8613de4a8afc4e22d28d1a99118 SHA-256: 30f57b032c69eca4037e349116ee6f7afe29363ca0b9f6501626fc3aea4a15e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and contains a high-risk heuristic indicating it instructs the user to disable security software. The PDF also contains numerous links to external websites, some hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the heuristics and the embedded URLs strongly suggest an intent to download and execute a second-stage payload after bypassing security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://krisoc.ru/uplcv?utm_term=call+blocker+with+blacklist+and+whitelist+free PDF link annotation
    • https://nilsahost.com/calisma2/files/uploads/watumanozazajajar.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421d585003b---jajefovizelesifidu.pdfIn PDF document text
    • https://go2germany.ru/files/file/fewotoza.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/17363599002.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/povofejij.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/sedok.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/71350797710.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/kezaxaxodeniputolobonowe.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/86094444421.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/tipudeberufifu.pdfIn PDF document text
    • https://teamcode.net/upload/files/lugafis.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/30873702278.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/lupogeguluja.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/25663137683.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tf4envgsnc91lja239lfib3uvm/savokagiwagu.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/todimirovubakolilutem.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/27052030543.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1b4d3d0d43a115962bd8c7d81ce5396d/waxazigakarifu.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/bivoporuliwojatusi.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wetawokaviz.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/pepot.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/bidojalit.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ab56fr6ep11bftibdi9ho9vcv6/53274376637.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_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 19024 bytes
SHA-256: 2644b07f52247f15baf8be1ddd970378418636294da8c5f3b19599cdc8262a03
font_01_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10920 bytes
SHA-256: 555b371a59a56f8722b822397dea80197f5a32b31321adfb63bd826889018790
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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