Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92e3d8e967a260b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 23:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34ca5f3d7d970a46e7fea6b4771ee260 SHA-1: 12de4ff533ef4904d24afc6f67a4be1d40432edd SHA-256: f92e3d8e967a260b3a701de90baefa2cf0a5e0f54cb8a66f65ee0e96d024f062
156 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and likely contains further malicious content or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=best+free+bingo+app+for+android PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7904f997a29cdab07b6b9ee52489e45d/33891753940.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/37472671334.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/nutezofejenedebizitil.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/dorozediliv.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/84711677883.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/34806551038.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/rekumadalamediparoxosune.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/26121727245.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/viteminolupowomowiworaj.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/71428664037.pdfIn PDF document text
    • http://bjjiffy.com/upload/36362751911.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/dulido.pdfIn PDF document text
    • https://salwangurugram.com/files/72465939961.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431b7fb33dd---meririxozebad.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e32587cdb0---tisanobi.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210909103100.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c3bfc14ec0a231be7be314e3c6bcd094/1842896045.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417cbe32bf7---96004302211.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/39084041357.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131917523e19---waxigaritujigipivifaris.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/vijunulitesilepezole.pdfIn PDF document text
    • https://isleo.com/i_photos/file/winisifaw.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_off0000ae41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE41 15012 bytes
SHA-256: c51c1c0819fdc6688b8aa866e6a19f5cdbd52b37256d1b5389ce3cb310eb6d70
font_01_sfnt_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 10820 bytes
SHA-256: cad9b7877ad02318b46816c5e6415ee9a609023228175268e21f2abaf32d3649