Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4fa9fc48b25b20…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 19:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e581e333b4b3406c3f88b1a8391b01d SHA-1: 3e233c66fb6a0106d325c74d7cbfec8a6a717529 SHA-256: 1a4fa9fc48b25b207610cc51647df34fb1001a3dcecbe044c4647ff1c66a436a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on compromised websites or disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=media+player+lite+for+android PDF link annotation
    • https://wfca-czech.cz/temp/userfiles/files/sovivez.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/jimatit.pdfIn PDF document text
    • https://mavibusiness.it/file/94208625080.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/32451414381.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/60166893853.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2b6ee989---lipuxuzegizebavo.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10443612590.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n5pmrvsgnahrvll6g7168fo848/pipusonidupefajumo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/99620263884.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/32044742681.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14049e86e---rixebosofizigagilo.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/17454277721.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/85163432212.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/21281754418.pdfIn PDF document text
    • https://forumsevens.com/images/file/nuguponudidib.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/dekarakiz.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/64743963150.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/nixipaguwuzoropowu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/luvitirawunilafapazew.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wazusokolanukomogaperuk.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/18/file/xidosagagojava.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/93364665326.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/satogutotinaw.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/10700655669.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_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 18116 bytes
SHA-256: bb0b7f4099d1da6c8a423d0a02341f13310414d4d02eec34b35a6e7b44744fea
font_01_sfnt_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1A 10428 bytes
SHA-256: 8853c3a9acb097f52bb03ea9909c8b65ade0d079e8fa7f576c41d83562a66a4b

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