Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fc86423b44fc98…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 01:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f2b86f820908aa613c42e84fb0c4e3a SHA-1: 79a4bfce199c1bbf5f605480193cba2923c2815a SHA-256: e1fc86423b44fc985f3726004575318c0a350abfcfc27a9eefb9685ae8ccfc02
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate it's designed to redirect users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7502891a---rebate.pdf In PDF document text
    • http://zaiger.ru/img/file/vosamomafatinix.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346d4c59eef---nelel.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wabalolidizit.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k489nfhpp7kjc9qave5nc7tnph/malukegonilimenonikotejel.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/witurukusakajugodotogo.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/bexoxubujeganetubizu.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/pezedekapafovoditebibew.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wizovevapogadopi.pdfIn PDF document text
    • https://hobbypet.cz/files/file/39580741437.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/babenaxivixami.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/buripitixuxanola.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d7e1a28d994e6d7ee06329940291120d/wuziwerefamokasut.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxipizifoba.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/61894619717.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/putejurogikaziz.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/powegubowosanevanis.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/55046756967.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161343220dff77---rorasezozasones.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/dejugofaxowitu.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/10840005277.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/livareweziwokobupag.pdfIn PDF document text
    • https://sealskinz.ru/files/file/63660428757.pdfIn PDF document text
    • http://mutitar.com/user_img/files/89651501828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sistemas+operativos+alternativos+a+androidPDF 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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 10696 bytes
SHA-256: 743f00598b90a301285a06d73873d01cb8c6b253ea357d3c587173d21cab390d
font_02_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 18780 bytes
SHA-256: 14db00d36bf5d08a6a0520fa9fd477f8fe02333e6cb627bece58cae9802e6ea3

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