Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4785e4351adb48…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 00:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9cfe6ca60689a9b242c3f89a35b0334f SHA-1: 5037683476b5f835bf6a5493cb429cf6acad8f40 SHA-256: 5f4785e4351adb486407ec2f42143df247795c5809f4681a77eb0a0815214e3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to distribute or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.iieng.org/editor/ckfinder/userfiles/files/giramo.pdf In PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/bigopetibanupadilidebop.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/datepudepema.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/26043176030.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/supipelewolamudoxaxotilup.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/93253976312.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/xifivi.pdfIn PDF document text
    • https://alkoplast.rs/files/31356007423.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5aa22f14---tumijape.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/40667634701.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/revibor.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/69019727874.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613593dc08ecb---meworuxawopotopomawane.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133113204214---lazuvenawuraki.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/57500111463.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/58163967112.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b793ec9e61c6ba9364c1141a444968d3/62181629193.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/notalulapipit.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/97880159168.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/58753146611.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/33229480306.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/72284076300.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/mixeriwamoso.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/jevusud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+platinum+rom+download+zipPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 10724 bytes
SHA-256: 19fc0eb56c3f212a536349f7c6a85f59af0c6b3181c6b91cdb665589f5d4f95d
font_02_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 23984 bytes
SHA-256: d5a5dbbe931287a6c2e62f1e88bec630b15b3846110e8edf19015e4e4bdb212f
font_03_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16980 bytes
SHA-256: 69c65640084ff01e62033c58b43a6ac0c3f97f990f8b53bdb1fe4c3ba7b0e492
font_04_sfnt_off0001433c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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