Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e1b96ce5f6cd12…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 12:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f9f3f243d7bc82d927d6922cd4c6864 SHA-1: 7d8900afd308a8f08e8a176d7018432f1146d810 SHA-256: 40e1b96ce5f6cd1284c7b770083bb2a8b1fdc871f987c5b6ab08b9d5d26e3baf
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to disposable hosting and compromised CMS uploads, functioning as a link farm designed to trick users into downloading further malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://responsible-tourism-alliance.com/content_file/files/95973014042.pdf In PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/daxuvurujisak.pdfIn PDF document text
    • http://levotst.com/uploads/files/fenobarujuxer.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/11237822010.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/bedipidajiwukimokatem.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/96355701189.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139087b4a1df---wivobuvemolup.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/12390297144.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/74939113232.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/92520139898.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0f475dabb441e5e13f1111ed7254b970/43334315425.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/75570507306.pdfIn PDF document text
    • http://kvrhousing.com/uploads/19604179264.pdfIn PDF document text
    • http://ed-union05.ru/files/file/13523047232.pdfIn PDF document text
    • http://firegallery.ru/img/upload/90875757384.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/4560236682.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/lezagawotelukito.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/rifosupuvi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb293b7e9---repajaker.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/nakubesudote.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f45076308eba481803c23929615322d3/semovepoga.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a8a54721---31652592871.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4c228d4d0117230986e0d02cc6073f89/99209662181.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/52243069741.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/sixewid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=critical+strike+cs+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 10264 bytes
SHA-256: d40b726c3405cb205016ac2fcf5a0b496a1d7e6a8c34e6fdde18f34e6ad008c4
font_02_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 19304 bytes
SHA-256: ced337855ca8cc094a8739c9e5d60e41a5f6102e259ee9863aa26be74e9bb439