Malicious PDF — malware analysis report

Static analysis result for SHA-256 e804cc78697da830…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 17:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b482abc2f53d256526cb76166fe625a3 SHA-1: 70de5e711808d86d94ce9553eb7e6c7d81d5a3ec SHA-256: e804cc78697da830ae91e08fea2124f54b80a9db1b2f520d07245dad966e4afd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614165b94d8db---40486389686.pdf In PDF document text
    • http://bkdesign.ee/userfiles/file/57852019599.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/223e1c0387197c52e88bb3d3ec7e5324/gotitasolidisonox.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/97102190195.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/91418518925.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/kewidolev.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/gawupefipuzanefawuvusa.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/45829464163.pdfIn PDF document text
    • http://pjteam.hu/uploads/47575027084.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/92078404032.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/kapedobunudujota.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/wemusexepozigujud.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/67755026079.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagufukujerizilo.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-09-12-22-01-53.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/96506825803.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/tilelugoniwamomi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/71594911540.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/df855e999a00a1ce56cbf9a884b74491/nenipujugezawovexokow.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/49259687240.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/nazavamajifiga.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/1767300658.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/32232690353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=galaxy+a71+firmwarePDF 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_off0000c0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0ED 10328 bytes
SHA-256: 37c276ece62399186cd309db1c4888adbac82d8702a9286679b40226b3b8ca58
font_01_sfnt_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 17460 bytes
SHA-256: 463c30c22a6c456ddec0cf13ace4bd51dfe49f52ae23bf261082cdf86edf8b28
font_02_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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