Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7091159502c622d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-14 01:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ccb5c8dcf288c2264c53e30ce31e525 SHA-1: 794bae3f448cf60b64e1dddc881638d2779bda15 SHA-256: f7091159502c622d1ec4617e18da6cf4efba2e7d925b74c41ed9b07100289593
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://073741256.com/uploads/files/202109131714389196.pdf In PDF document text
    • http://meubelenindex.nl/images/uploads/sukonum.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/26308101602.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/nidirukeleridoj.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/57871111574.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/xupiwisusexebotazonad.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/79765481638.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/sowupolik.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/wowesamozebodogifunipawud.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fpv7fhqel4k5kin7mordhq143/36322775556.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50241695826.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcd221de3---20586153381.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/97106081787.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tigawevibadivesilifisof.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/207335189.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/24432827911.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/leweleralan.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/lomidifegutada.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3e8c6d43---rewobosasusanod.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/9194005564.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/libudepubesaxejexolut.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/43103171216.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/mawej.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/surolatapenuvogid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=galaxy+s4+infraredPDF 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_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 18440 bytes
SHA-256: 380bb8573e5efb6fc33ea476d4c458eb81e2c86db8a8a35f03a4b87feeea60b7
font_01_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 10460 bytes
SHA-256: a7e3fe84bf1623f1612a266253f9bb4f3e23f72b0ebe81fc6444c906f32a1b6b
font_02_sfnt_off0001409d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1