Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70df2a63254450b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 16:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ea2f805c5a44b34dd6474ad13141692 SHA-1: ed62020b696746cd216e1d43ba9919fde0a1a47c SHA-256: e70df2a63254450bfe58533c3113e338424a5dd0127328f10ff6366baddd706c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, 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 malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://synerhu.ru/uplcv?utm_term=where%27s+my+android+auto+app PDF link annotation
    • http://tcgardening.com/userfiles/file/2021090121514073499.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/3160445094.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d419c46480---61119914464.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/61468174306.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/dogigezesugunisod.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/kunusivazuga.pdfIn PDF document text
    • http://underbutter.cz/download/foto/gesezotiv.pdfIn PDF document text
    • https://profm.hu/files/file/migug.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jutuxosuda.pdfIn PDF document text
    • http://terrietanaka.com/library/files/45819409035.pdfIn PDF document text
    • http://salt17.com/userfiles/files/vamigujuru.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9ef87979---37513761404.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614a39e64b451---23979606085.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21d6f118f---rutebopadilajeporoda.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/828255739.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/16177978783.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/vanokix.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/9904660749.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/jawofiw.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/22369385890.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/dulopumufogedomaro.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/dijilemudonemep.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/noov4qb7poph1ob9oue6bfi4b0/bawewif.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/digidutawekexerurofemob.pdfIn PDF document text
    • http://ns.adobeIn 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://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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 15044 bytes
SHA-256: 5f4678f381ca5db36b8c4969537dcca6f338d20219789681f6c735bdd9182de1
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 10852 bytes
SHA-256: 17f8d0d5cf75663fbe012bd04edaa483bb5983694235a043c8fc753b5134fe93
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1