Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f73f1126d2129e…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 08:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a0de5f3cc9b13a0a54e6a97b571146e4 SHA-1: 7347996fa989c0c78afb8c7e2636ebc8f678d5c3 SHA-256: 90f73f1126d2129e9b0e2b7c31680f37d8ea2f50e544069ab322d8837612782a
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xuantruongtech.com/images/ckeditor/files/xumoritepebadinopetor.pdf In PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/rinikezi.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/45484584873.pdfIn PDF document text
    • https://preciseenergygroup.com/media/36667440426.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/67372510909.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sejokivapuligusivovoj.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/69252305528.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/3951361555.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161487b5f98b5f---vitidemofidulavaloj.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/vomosumijogotefokunek.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a600655c15a5a5955a7972185a583afb/47361738640.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/28677619628.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/93470805781.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/34069279154.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/11518940617.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/829962897.pdfIn PDF document text
    • https://luminex.pl/upload/file/96363645221.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/niletirutaxositenomif.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/zazametegi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e5dbca58ef75ade5709b4d42c219ed31/mobotis.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/80350644492.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613faf1e0df03---rilujanagarurapovedesil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=come+passare+dati+da+ios+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_off0000ae8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 16520 bytes
SHA-256: 4fef25c05aa4e6652ff6e6806a0f248684562b282b17736a1d30765471da5574
font_01_sfnt_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 10540 bytes
SHA-256: e6ad1203885fa518944cd2dcef7c6ae541e9b6e04e512ddf57500b2cef280a8f

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