Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0947ed682480c6…

MALICIOUS

PDF

89.7 KB Created: 2021-09-18 21:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc8e6f4631ddafa63432f158b28a914e SHA-1: cc2544393d42d31b462efd9755cb0f9950a39f6a SHA-256: ba0947ed682480c64beb330b8dd5438642946de61d225b433db1f09371f56b27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with spearphishing attachments used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://infrive.ru/uplcv?utm_term=bubble+shooter+dragon+pop PDF link annotation
    • https://ekoelprom.pl/public/images/editor/file/98127210672.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/53538315063.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/16384984899.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613713997db9e---kepebuvigutevonijabe.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210915_191934.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145defa67fa2---64429985005.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/93196030260.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/gikuxomemoxoto.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/8829735387.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/96535898127.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fisazifalonebidor.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gijozu.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/ferotapebitusute.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/sivavetijozoxariwof.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/nadupikivajesaxivipuvuz.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/bewewunadi.pdfIn PDF document text
    • http://mfcpavpos.ru/file/44400278017.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/88577354340.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/sivazezafokibubavapomuw.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/sejosirezaximawodekowo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a738fc7760---bimuliguvoguteki.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/60260501499.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/phm5kh9k0hcbb06c16har47au3/pogomobukazo.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/witedisobebakopa.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/69947868151.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109161138069706.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_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 17996 bytes
SHA-256: 6a2c94c245ac1b65593f55a87624bcd9a0c1df82688b0fe33cef410fa2fa2e3a
font_01_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001401a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401A 10872 bytes
SHA-256: d3198fb7486f560ae3a86ec0b53c48168dd5a114ecf14682f953ed6808b074be

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