Malicious PDF — malware analysis report

Static analysis result for SHA-256 603dc4497aac7cbc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00473239b793cdcce0b53dec62513628 SHA-1: b5536b78368942bccccf2f3f47d019b8ce79c16d SHA-256: 603dc4497aac7cbccc3d7f5b9d48556e3c318e3f5bfd8b0819ac8e56ca9804ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/xurilomadaruj.pdf In PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/xasakufabegitemenobiduve.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zekosusewe.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/zejajasilavujulana.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/sunulinizusine.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/78985637684.pdfIn PDF document text
    • https://nada70.org/userfiles/file/musupepazazoselomewumim.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/delotabizebelesavapube.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/savunuwamigudigixoriremu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136db90c2db7---17148925250.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613defd3023c0---15391386076.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/45cd3eeafd321ee3d4e5a96898004a49/88874675533.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/55519303587.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/finuzuzelexezexelododi.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/99449090818.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/dizejumewakoxoloweraf.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614903508eca2---93470640966.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/82382021117.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/fuxifokeduwupasum.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/jozidapem.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/89461716725.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/50745620834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+update+lg+e400+softwarePDF link annotation
    • http://irodori.kir.jp/files/file/sofor.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 18412 bytes
SHA-256: 3d2861287fb837d27b710a8f50b0bc2bc760f55d519387142053e1c6edb353b0
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 10856 bytes
SHA-256: cc22082dd8fe5fd27861e868c1044e5db8c05a6172e20982976f37d3477d62e8

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