Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3742278321ffab…

MALICIOUS

PDF

88.6 KB Created: 2021-08-05 17:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31c059d70fab11eb0ccea479f8aaf2a4 SHA-1: 44d2c4c0e250bab4e41d36d253510494499822d2 SHA-256: 6f3742278321ffabaec35e809895733faaa5df901505201bfdbd18d3aa614c78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The numerous external URIs, many hosted on compromised WordPress sites or disposable domains, strongly suggest a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=lista+verbos+irregulares+ingles+b1+pdf PDF link annotation
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/nafilejiwejuxakewokapiku.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30f6e7889---vuwuradiwixapezonukeleleb.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edebb6a8c0---kotuzoduleteme.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/6275cf15b0dc83dc576ee168aa842a83/vasasusopixolikafuler.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a204d046734---30008001529.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/94847512989.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/vosanarosamudabifugugav.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/93701006601.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f856efafe0d22e77f15494eedefcabe/vodupomisigeboporoj.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/vavilelusemi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5aa90b481---99263352203.pdfIn PDF document text
    • http://bienbao.net/uploads/files/guxiralawalibevipugezoxu.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/89404936219.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/lerasojafikanuwuxil.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/a2hcolh8i37tludhvrr80i1a5i/26338005617.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/cddfacad769cb6794ba5c636b65158e9/kenizoputiputigubojud.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210708_79FA36505518A26D.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/71a5e3affd4918104036d2a31932f854/zogebexutar.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/jadogewilo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bddd115baaf---61113314940.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/79045f6c850a7e61abb5db712950083a/bodilinosezabiti.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/36567132100.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c953f077d7f---bugoruwavitibakidafarat.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d59b79091---59066810571.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xopadoforobevikimoro.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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 17884 bytes
SHA-256: ce6dbd4c8142e8c933c3b8e4d8218e66bc89357b395bea81b07a613a7810e410
font_01_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001394e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394E 10988 bytes
SHA-256: 329697b844debe2ed323965f8ebf92be9194b2ac27d74e8243e5a5dff22fe900