Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb49426f76abc88d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 01:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 887b9d6ed7d2b7096166b18ea14d94bb SHA-1: 61165efe3c0e3f0f0d0102f7f46204727eed2830 SHA-256: cb49426f76abc88dbd1777bca110c324086eb90d1b432213b396a579674954ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lyonsinn.com/nbloom/fckuploads/file/65534296049.pdf In PDF document text
    • https://rafaela-motores.com/userfiles/file/pekamafonetawatamazade.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138bb635a3a6---foxop.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xulodosegegasemimebot.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/66205065751.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f027b60709---zolaxawa.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/xefas.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905113100.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16137602b86e36---roxenabogipuwalesadixeduk.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/dadebipefunasizim.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/23390495488.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/74570523011.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909054915.pdfIn PDF document text
    • http://tradotel-riviera.com/file/sijasitudogunepuzureri.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/91525653239.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/pufenekajolas.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/91580885478.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/lobusorivurabutiw.pdfIn PDF document text
    • https://agrando.cz/files/file/badedolipefu.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/73624328672.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/vuzitobakedavipowepo.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/66182260807.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134e73019d4c---kekofugafeteb.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8p5vjafndmdopi5dkfvps70t7s/74808268919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=characteristics+that+start+with+the+letter+ePDF 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_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 16536 bytes
SHA-256: 3b4f5757053913f5cfd9357b990f53a59ba0da2a5727e4a5f95cdf1f6a71b137
font_01_sfnt_off000115a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBD 10220 bytes
SHA-256: 97462721b26c9fb2e05127d140761f75cf0f1195c41da7050ae1d9ec6ac11c01