Malicious PDF — malware analysis report

Static analysis result for SHA-256 a673c20b903df861…

MALICIOUS

PDF

91.7 KB Created: 2021-08-09 01:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 2bc9dac8edb1d8cdd4fd8ea30d9a0979 SHA-1: 294c845552e0d0bc8d16c2b544c77872334f3abd SHA-256: a673c20b903df86114be35d4c96bb4f9db7a9f4a88b6e263ba0d66b5f436f487
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608de8be5c880---tedupunodeligoroko.pdf In PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210723_091623.pdfPDF link annotation
    • http://cameragiaminh.com/upload/files/gukisopobonupe.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160711879569bb---vafadivogelira.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/nabru7a3hi3scgb9lmdmi9j30k/fanivafutajejezalul.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/musiram.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81667baa73adcfafba00ed22fe8754b8/ratib.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/valokataxulowiretanizuvag.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3ffba517988e5e0e40e649b1f477e56d/lulowu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbdf328e1---82190302150.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/20040353113.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/81597231280.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2r3nlf02eiuj5oavpuo3saneo1/galurusupesizejidimomavo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/tovipiteni.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/07d44415a5263ef83ee284defdc77ab5/numepiwumexonoveziderowaf.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/80027018294.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7a2190bf---solur.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160778d7519407---13784127334.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec77e3d674---vibot.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aebbefe08c7---27998349540.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902ff4483b3---56493874212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=volver+con+el+andres+cazares+pdf+download+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 10976 bytes
SHA-256: 73a97e5e05022efab2da5086088f9ef770b6b5f00cf6a0459e26f58f204bcbac
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 18492 bytes
SHA-256: f3cc053d4c907d4dc97834701b5d8d30bae643b8822d86569011f407818f87e0
font_02_sfnt_off00013175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13175 16404 bytes
SHA-256: a7098f0f57054259285ba915b17265427b3b99d5e5b653e879dc5ec7ad9c35d6
font_03_sfnt_off000147d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1