Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca23b780ae2f0f93…

MALICIOUS

PDF

76.1 KB Created: 2021-08-07 18:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17e343fe5d9552f40c9f8748fa83d863 SHA-1: dff4238aa7df46cd182e5be1f4a048eb149d6e9a SHA-256: ca23b780ae2f0f93c3eb4ee38e4a2d82d1108373167b71a0c1882d4491da6864
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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 https://pistant.ru/uplcv?utm_term=libros+de+neil+anderson+pdf+gratis PDF link annotation
    • http://scantech3d.com/files/93399546502.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/78224281770.pdfIn PDF document text
    • https://jagominum.com/contents//files/timijibojew.pdfIn PDF document text
    • https://agatanorek.com/files/file/24723650425.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c57f9f4e283902a0ab6d2640883cf97c/54572306520.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/95629050122.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c65b2ed1f46---dosubodevele.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/69369045210.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/13692147123.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608842bb78786---sejoli.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad1d650b1---baravananewagalisoviwim.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/bividuxalasivemew.pdfIn PDF document text
    • http://africareview.in/userfiles/file/tozezemezuzazax.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c749161d4---bokidaritibaguxaponepa.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/6af677c0b320f143a3533f423f04cdfd/sabun.pdfIn PDF document text
    • http://sartor.ru/upload/files/veradokojipamit.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2ab55e4b138b0c5c2b1ffe5866c23229/32546713257.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be95e753b---jonobomugevebuges.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/15653391803.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/34888623220.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/lemaguteweludufupowep.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/79896399618.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0d6c13cbc0ec7faae237cb31f31672ec/46938849250.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e2eb7753ca7add35060c58ec4e5d865a/dezekedilug.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/91582972536.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/5350223851.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_off0000c6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 16400 bytes
SHA-256: 4bcc54233f37dda67a3b305f40cd61fc61716fc76805d25dea5a63c14efbdd1a
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10768 bytes
SHA-256: 66f14caed2ae905a7672321eee02d114f1e1fbc5f788a20b4db15560ab13c127

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