Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ba86dd1c732db5…

MALICIOUS

PDF

101.5 KB Created: 2021-08-10 08:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 357ce3f7f7d5b60e2dc4d038158e2d91 SHA-1: 1382f4088b1a67b9f210c8e7ea6b9b698ffb0f1a SHA-256: c9ba86dd1c732db5850cb7ea91b6331ef53f49a6c0084e4036426f6c6e2ba0e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to compromised WordPress upload directories and other disposable hosting sites, suggesting it is part of a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=what+is+neet+exam+date+2020 PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160710d74b669c---27207632086.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c696b8f6---88010129862.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70e4d4bb9---xivotifegafafa.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/60793032670.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fa466c66b4a---28796821940.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/11232006684.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/32277531050.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f71de756---42639726477.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4221549e---76671725811.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094b6f8e1fc2---91509443157.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a838cfc8---kikuludoxutuza.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103847a4ae07---gazogojupunu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/62c1bc6a5e2f724f05c521726333904f/77074942008.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/21072700045.pdfIn PDF document text
    • https://viettrungson.com/media//Files/wikexijag.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/lakazaloganemu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00ded6ddb---35664453384.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/75445665506.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0f6da86b9ad1f90a85a5fea4f04c8a5a/begewalajugaxima.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/88057008432.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/vapifiwodevijogetawo.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/29125232248.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833c821c00b---nigusopadebenebivel.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/rixorukaguxukiveva.pdfIn PDF document text
    • http://napiarsaigh.com/images/xudis.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_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001405d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405D 10584 bytes
SHA-256: f1ea99c48458a116ac4740cda26a9ebcc2914e5bddbff1fae2a600ca874753c7
font_02_sfnt_off00015872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15872 17528 bytes
SHA-256: c8699859e9b78276de80708aab40fc7377232b90a438c2d749a5308f1c93615b