Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ad11cf8f1c5007…

MALICIOUS

PDF

68.5 KB Created: 2021-10-04 00:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8d70b00906f9ba46b72c41e6f4716f5 SHA-1: 6dde53ed3b89b6b61c349165c47bcee48603b38c SHA-256: 65ad11cf8f1c500782c4ad82de06401ebf3478de65735814c5a9bff09f0e6f9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

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://medvor.ru/uplcv?utm_term=what+are+characteristics+of+aries PDF link annotation
    • http://akademibt.com/resimler/files/36381678869.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wekowulosa.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d3d3b1119d6aee3896ae8b3cb8174661/zezakazomafifipigavani.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/neputinad.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210929055032219767.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/xobixenalijatufag.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/legepufebusa.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f97ec2368---kasamaxuvajepe.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fatipetokoxupire.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c8341242---27801142566.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/11159912959.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/94689362843.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161421819d66e6---kanurafuvorud.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/97035094803.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xeledabotujobexikurokoja.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/34031338288.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/faniketakinegokib.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gudosokiguw.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • https://implant-drill.com/userfiles/file/tixijunufupobobebumozusoz.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_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 10276 bytes
SHA-256: bc12fd4e66d1089b6c2cf4b398eb1eea493fe927008c5366c76d5e6f74cba741
font_01_sfnt_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 14864 bytes
SHA-256: 60f176831900a6376108275427e8950048a4f835d694ba714ecfc987bba3abd1