Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7a0618f5a254c9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 01:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df27fe2c9f263358f1a56d3290ffa8c0 SHA-1: 7c353af4a3bfbe143b189cf50ac540b50850f9d9 SHA-256: 2b7a0618f5a254c962e58904601e7f3083a0beceebd4efd40277841ca10586e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised URLs.

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb3b2b106---86180526386.pdf In PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/gaber.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xikufonofexoz.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/12284200148.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sebozojuker.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/pipigavezepetidubigajar.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/81697517690.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137e34772cd6---99722546318.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/munonitabimuzi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d5e1d7f7107a16c4bd53e021f53167b8/69294368634.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134480745487---51263229428.pdfIn PDF document text
    • http://rld-carbon.com/file/11956082288.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/13849009967.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/6378105839.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/werojer.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/50706652095.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/5545275400.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/gatekosep.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/67653123882.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/4261442592.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/57384787894.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/91517700728.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/87897518542.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/46450070645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=emulate+windows+on+android+tabletPDF 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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 18012 bytes
SHA-256: aeaba520313565db0f2075301bd61c4322e633d8d4b5b0495be2b3279e6e8083
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 10716 bytes
SHA-256: 32c4df70ef4f45616a0d541fbbb2651bfadde5eae1e340c1d84cc3b5e5145cb0
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1