Malicious PDF — malware analysis report

Static analysis result for SHA-256 2966db44c37a042c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 05:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64d57a55de29308cb46c5ed554e217b1 SHA-1: 0fe4193ec4a89a8848c3a78a310d7948113d929f SHA-256: 2966db44c37a042c8347e1a5de0d2c6029d054279fb2d969107f939e0d5d9eb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The presence of numerous external URIs, including a link farm pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=vedas+book+in+english+pdf PDF link annotation
    • http://www.tomasjelinek.com/img/pub/file/sanujigufefivagagefimotu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608567202c380---69448862213.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/71021871862.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb59c6d220---luvumonilafawugesuti.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/54226168307.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/pifusefojoxodomikogara.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/83300191388.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d568a9004d---dakavulo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/modesiforepamunol.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/89879983107.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/33699299864.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/himsc6mtj0ktnmanuj8s88kl25/nobabukozisomixevefovev.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210604_085014.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rftloq5nbgqv1brl93to3pap10/sedowo.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/zizogerololororusepo.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/56505203829.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/lojisotiwemapigedidezet.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/86edb583ac01435e25bffb0c1e506019/fotajolalugome.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2957e6a29---jovusalobiv.pdfIn PDF document text
    • http://asfalon.com/__files/file/gepinobolilinufezoz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/zirebomamawu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099165750dde---selosa.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/porowigubugisotunezinatok.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/70108085291.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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 18512 bytes
SHA-256: 896dea45cf57415d2191494abc745eb372feb5439e84e9dfd187f1e55caad28b
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 10780 bytes
SHA-256: 86a3a8572c37a1c6e5115f68c9c78920cb443539a58677d4b8eec5415652b8a8

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