Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cd51673999e21a…

MALICIOUS

PDF

100.9 KB Created: 2021-08-13 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b83c0c4f1c1b7b6381476d2c8bb2695 SHA-1: 7c53afd451144cfc33c8ff5c25d252022e1d0aa1 SHA-256: 17cd51673999e21a70b7a9dc284cb56aa9ca33a051f784b355ffa2ebbe627e66
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that this document is designed to function as a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72ffb49ee---ramowovakibijitewu.pdf In PDF document text
    • http://chip-chup.hu/upload/file/55708003782.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/49625549351.pdfIn PDF document text
    • https://senfina.top/uploads/files/82592942471.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/zukutisurefakiziwevopo.pdfIn PDF document text
    • http://lyshiying.com/d/files/39978744348.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/84988401684.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/60905155022.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1165460d98---zomatet.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/nilowevegopawun.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd052bcf38b---juxujatekewaguzefoxamal.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb00fc34c9---wobupilowegezibalileri.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe6356289---lujifipirogenubokabirag.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8751dfd60---xejelalo.pdfIn PDF document text
    • http://haphadoor.com/upload/files/80727643204.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/nidulu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/pc80jnvpi0l1v323g1ntabqbnb/79349291127.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/77156652329.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/dibadarebitokenojagenup.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/foxusoborasuji.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/20808565700.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/57818739000.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/89223186706.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waziriroxi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b788e5132c1---67751052324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=collective+nouns+exercises+for+grade+3PDF 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_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 11124 bytes
SHA-256: 6409af18cba83290be0c2240408c0309ac74016b6ecbf9769a4d02032bf2c63e
font_01_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16104 bytes
SHA-256: 74d5ff912e5206794c4c5add27155c5ce5cf5e1ff194f0a33f59226646a82e31
font_02_sfnt_off00013ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000152f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F2 18588 bytes
SHA-256: 46609131bb0ca56600ba121a623aeab234a62fddf3c890e72bb76f74ee420a05

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