Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27493bd5dd37e7a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 04:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c78a44f3f00eedee8e3db307b746085 SHA-1: 2b328e50ea7fe5d52ef6524a67287ac4e2512b83 SHA-256: b27493bd5dd37e7a9f03d20ffcb8e3d2dde69749fb1ad8a5dde0d4e31659b37b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+do+i+download+original+vidmate+app PDF link annotation
    • https://rimsball.com/ckfinder/userfiles/files/35006480843.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/91536384522.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/9961088757.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/77981239879.pdfIn PDF document text
    • http://biomehl.com/images/content/files/powumokofus.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/76534665157.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/roginonugukenabuxebes.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/kabas.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/45624021640.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/keniganulugutiw.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/41178674220.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908095306984086.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c115756f1---55734638907.pdfIn PDF document text
    • http://www.depomatrial.com/file/raxuxulakibijek.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/78070030493.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/75733608221.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d869c4203f56dff43df446e11733e80b/94519692677.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/48577581168.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/33410316196.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363bba883ac---dulutasafisig.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/pexifabuzogufe.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/93590847515.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/31384169020.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_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 18008 bytes
SHA-256: dc017a86a0cc946d08d746586808c4b97f1f99f24e6417b127dd50091adbf1ce
font_01_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001232f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232F 10708 bytes
SHA-256: 5fe5d4eb766bc6c17321cfbc927cf2450f4d4bdf482d31f84ca73beb0a7f0a5a