Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae68f311f444082…

MALICIOUS

PDF

86.8 KB Created: 2021-07-19 23:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce0df64feb9832e5ba1637e73f6f4fdf SHA-1: c754c436e646b7628f2741d9e6a8d5ecb4961304 SHA-256: 8ae68f311f4440829f85004937096b77b789d3dc710f873bf28b22094dac6b20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The heuristics indicate a link farm designed to distribute malicious content, with ClamAV identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bangkoksolarpower.com/syner_upload/images/files/notir.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/95500528137.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ee6e036095c11db8d74142ba56eca350/1975429650.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c00c1e179---84379335144.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df1b862ede8---luganulijidax.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9b01f99d08a824991670b873d0e658d5/96220475672.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/2f21b641281e49f508af48db00feec9b/15015658503.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/38fb225807f7a9c1f5cb3b55fc3a469d/41973926700.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/tunizivuxuzububinox.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/rutekafel.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160949a2ba3e9f---65175047643.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/jf3jdsd7dneromhsj6aqd0obm0/85355837102.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tebodisifijetenivo.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/76446436381.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/79601025046.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/sutosaz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad7b0daef---naruwerilavupuge.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dced4d337ec322c3a5ee79de5ab86fa/87106971947.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/95866994330.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/velufegovopo.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/35800495025.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a755304af---borerotedokemi.pdfIn PDF document text
    • http://farmina.ru/uploads/files/28278884121.pdfIn PDF document text
    • https://allianztc.ro/files/file/mugogebafazokijumavij.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/jokodanorebebotaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=merry+christmas+to+you+and+your+family+imagesPDF 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_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 17016 bytes
SHA-256: 00c654e4c7d72a788b87b62edd7a12a09343ff94cc6703d97228285061059a12
font_01_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 11132 bytes
SHA-256: faea2b50ba1056764af92cde13a4d60452b54a049ce38a36acf5946f12e16950
font_02_sfnt_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1