Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e9d7b7562cc98c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 08:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f05de7e40fd485e00eb419ae95643ab9 SHA-1: 40f0cc09d77728e62a9b5001a7638484d75137f3 SHA-256: a2e9d7b7562cc98c78386eafa5fedcfac8ef994a10ace55cfb7166cd1afbff32
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files, indicating it functions as a link farm. Several heuristics suggest these links are used for SEO manipulation or point to compromised content management systems. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=paper+model+airplanes+pdf PDF link annotation
    • http://metrocars.london/survey/userfiles/files/fejefutapite.pdfIn PDF document text
    • http://altinay-law.com/images/file/68310128601.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/326902526.pdfIn PDF document text
    • http://myqself.com/upload/files/24215782204.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pvo2v9g85ajpr5b558glr1hsnq/bafigajilut.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/rikoba.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/77466460136.pdfIn PDF document text
    • https://fasaac.org/temp//files/1587611914.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/5588065498.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e58eded8c3---40034427596.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/75abpam4gkgj8dsus637lp87vf/ziwekuge.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5312dffc---71840803480.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/53723326006.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/rekimojiwofowagidusim.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fidanezarolitobuw.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/xepafixozorolovozakede.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/dikurivupalipowit.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fexaxulif.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/waxutixaw.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/14696118064.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/62590781223.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/vizuritizisi.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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10560 bytes
SHA-256: f5e0516dd411248fa4b4d668f97cbedba2feb6a5291dcd387d028e856524e148
font_01_sfnt_off0000fad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EA 17800 bytes
SHA-256: 998e48660fa7b7277fb4b3543b92390d827dff01519bd74633f2170ae0a1b709